I think that we need to start changing the terminology around the hazards associated with cannabis from food safety hazards to product safety hazards. These hazards have not only been associated with harmful effects for those that ingest cannabis infused products, but also for those that consume the cannabis products in other ways such as inhalation (vaping or smoking). So, when we refer to these hazards as food safety hazards, the immediate thought is edibles, which misleads cultivators, manufacturers and consumers to have a false sense of security around the safety of products that are consumed in other ways.
There are several product safety hazards that have been associated with cannabis. These hazards can become a public health problem if not controlled as they could harm the consumer, regardless of the method of consumption.
Let’s take a look at the different types of hazards associated cannabis:
Biological Hazards refer to those microorganisms that can cause illness to the consumer of a product that contain them. They are not visible to the naked eye and are very dangerous when their metabolic by-products (toxins) are ingested or their spores are inhaled. The symptoms for illnesses caused by these microorganisms will vary. Consumers may experience gastrointestinal discomfort (vomiting, diarrhea), headaches, fever and other symptoms. The ingestion of these pathogens, allergens or their by-products may lead to death, if the illness is not treated on time or if the consumer of the product is immunocompromised. In addition, the inhalation of mold spores when smoking cannabis products, can lead to lung disease and death. Some of the biological hazards associated with cannabis are: Salmonella sp., E. coli, Clostridium botulinum, Aspergillus sp. and Penicillium sp.
Chemical Hazards refer to those chemicals that can be present in the plant or finished product due to human applications (pesticides), operational processes (extraction solvents and cleaning chemicals), soil properties (heavy metals), environmental contamination (radiological chemicals) or as a result of occurring naturally (mycotoxins and allergens). Consuming high concentrations of cleaning chemicals in a product can lead to a wide range of symptoms from mild rash, burning sensation in the oral-respiratory system, gastrointestinal discomfort or death. In addition, long term exposure to chemicals such as pesticides, heavy metals, radiological contaminants and mycotoxins may lead to the development of cancers.
Physical Hazards refer to those foreign materials that may be present in the plant or finished product. Foreign materials such as rocks, plastics or metals can cause harm to the consumer by chipping teeth or laceration of the mouth membranes (lips, inner cheeks, tong, esophagus, etc.) In the worst-case scenario, physical hazards may lead to choking, which can cause death due to asphyxiation.
These hazards can be prevented, eliminated or reduced to an acceptable level when foundational programs (Good Agricultural/Cultivation Practices, Good Manufacturing Practices, Allergen Management Program, Pest Control, etc.) are combined with a Food [Product] Safety Plan. These lead to a Food [Product] Safety Management System that is designed to keep consumers safe, regardless of the method of consumption.
According to a press release emailed today, Perry Johnson Laboratory Accreditation Inc. (PJLA) announced the accreditation of PharmLabs LLC to ISO/IEC 17025. Based in San Diego, California, PharmLabs has four locations, with three in the Southern California region and one in Maui.
PharmLabs offers a very wide variety of services including: California Compliance testing, a specialized Hemp Testing Program, Hemp Biomass Verification testing, and THC-free testing for the state of California. In addition, they offer the testing of cannabinoids, pesticides, residual solvents, microbiological contaminants, mycotoxins, heavy metals, terpenes, water activity, moisture content, and filth/foreign material testing.
“Our experience with [Perry Johnson Laboratory Accreditation] has been incredible over the years. Since we have multiple locations, we have had many visits with PJLA and their knowledge and quick response time has helped us get where we need to be,” says Greg Magdoff, founder of PharmLabs.
According to the press release, PharmLabs has plans to expand throughout the state of California and the rest of the United States in both hemp and cannabis testing in legal states.
The Agriculture Improvement Act, also known as the Farm Bill, was signed into law in December 2018. A major provision in the law legalizes hemp as an industrial crop. In August of 2016, USDA, DEA, and FDA published a Statement of Principles in the Federal Register (FR 53365) that defined industrial hemp as any part or derivative (including seeds) of the plant Cannabis sativa L. with a dry weight concentration of tetrahydrocannabinols not greater than 0.3% (wt/wt).
Globally, the hemp market was estimated at $3.9 billion in 2017 and the hemp seed segment is predicted to grow “at a CAGR of 17.1%” through 2025. Some of the markets affected by hemp production include nutraceuticals, food, textiles, construction materials, and personal care products. It is also anticipated that cannabidiol (a non-psychoactive cannabinoid extracted from hemp) production will grow to support the burgeoning recreational and medicinal cannabis markets in the U.S., Canada and other countries around the world.
In U.S. states and Canada where recreational or medicinal marijuana programs have been legalized, regulations have been defined to assure the safety and quality of the products sold to consumers. These regulations include analytical chemistry and biological assays to identify and quantify pesticides, mycotoxins, heavy metals, residual manufacturing solvents, terpenes, and microbial contaminates. With regards to hemp, the USDA recently released guidelines for testing of hemp. To date, the only required test from the Federal perspective is total ∆9-tetrahydrocannabinol (THC) content < 0.3% by weight. Total THC is essentially the sum of tetrahydrocannabinolic acid (THCA) and THC (Total THC = 0.877(THCA) + THC) but this may be eventually expanded to include all salts and isomers of cannabinols as noted above. Another complication: what constitutes “dry”? The CFR does not answer this.
Agilent Technologies has invested in the development and implementation of the analytical protocol, the services needed to support these assays, the required consumables, reagents, and supplies, and the training of sales and support personnel to comprehensively ensure compliance of hemp with USDA regulations.
Someone approached me the other day, wanting to know what was the real story about hemp and CBD.
He said he had “a guy” who gave him a CBD salve as part of a study, supposedly “the good stuff,” to help his knee. He couldn’t understand why he was the only one out of 20 people in the group that felt no relief. He happened to have this CBD salve with him, along with a second brand that he hadn’t yet tried. The “good stuff” had slick, colorful packaging, a beautiful logo and powerful marketing messages about the phytocannabinoids and essential oils in the jar. The other CBD product was in a dull grey tin, an ugly duckling, and not nearly so impressive on the outside- I’ll call it “Homer’s Brew.” My friend dismissed Homer’s Brew outright, as not even worth trying. I told him that not all CBD products are created equal, that you can’t always believe the claims on the package, including the cannabinoid potency displayed on the label.
I told him to search for the Certificate of Analysis (COA) for each of the two products, specifically, lab test results validating the CBD dosage per serving, and also the breakdown of pesticides, heavy metals and microbials. He had to do a little digging and emailing, as it wasn’t readily available for either company, but the next day, results were in. The “good stuff” with the slick packaging and bold claims had mere trace amounts of CBD, with some hemp and essential oils- no tests for pesticides or contaminants of any kind. Hmmm, no wonder he was disappointed. Homer’s Brew’s COA came in with flying colors – a reputable lab had confirmed safe levels of pesticides, pathogens and heavy metals, and the CBD level was substantial, with a detailed cannabinoid breakdown in the lab report.
In spite of the varying legality of hemp-derived CBD products from one state to the next, consumers are gobbling up costly CBD salves, tinctures and edibles in markets, gyms and online. Like moths to a flame, they are pulled in by the CBD name and lofty promises, not always understanding what they are getting for their money. They trust that these products are safe, licensed, inspected and regulated by some agency, otherwise, “they wouldn’t be on the shelves, would they?”
In spite of the 2018 Farm Bill, FDA still has not recognized the legality of products containing hemp-derived CBD, but some states have gone ahead and given them a green light anyway- check with your own jurisdiction to be sure. In the meantime, hemp-derived CBD products are slipping through the regulatory cracks, depending on the state. It is confusing, for sure, and buyer beware.
Separate yourself from the pack of snake-oil salesmen. Test your products for safety and accurate cannabinoid potency, and make a Certificate of Analysis readily available to your customers. Boldly portray your transparency and belief in the quality of your products through this COA.
Providing this information to consumers is the best path to success- safe, satisfied customers who will refer to their friends and family, and most likely come back for more of your “good stuff.”
Encore Labs is a full-service cannabis testing lab in Pasadena, California, providing all testing needs required by California’s Bureau of Cannabis Control (BCC). The BCC requires that cannabis products being sold in licensed dispensaries be tested for cannabinoid potency, heavy metals, microbial impurities, moisture content and water activity, mycotoxins, residual pesticides, residual solvents and processing chemicals, foreign materials and terpenes. It is Encore Labs’ goal to guarantee the quality and potency of all cannabis products while ensuring regulatory guidelines are met in the state of California.
Encore Labs provides quick turnaround times on a consistent basis. They take pride in offering excellent customer service without diminishing the quality of the work that they do. Their team of laboratory analysts/technicians are passionate about the industry and will never compromise their integrity just to make an extra buck.
Co-Founder, Spencer Wong, mentions their personal connection with clients. “Our customers don’t just see us as their testing laboratory, they see Encore Labs as their laboratory partner,” says Wong. “Besides performing analytical testing, we have worked with many customers to help formulate new products and do root cause analysis to pinpoint inefficiencies in their manufacturing operations and cultivation farms.”
ISO/IEC 17025 Accreditation has been extremely valuable to Encore Labs, especially regarding the new cannabis testing industry. “Our experience with Perry Johnson Laboratory Accreditation, Inc. has been great and has allowed for a very smooth and straightforward initial accreditation process. Their staff has been knowledgeable and responsive every step of the way,” says Wong.
Accreditation establishes that steps are being taken regarding quality and that laboratories are meeting and exceeding the highest testing standards. It also provides further assurance and confidence in data results as well as validated methods, staff training procedures, equipment calibration and successful participation in proficiency testing/interlaboratory comparisons.
Starting out with 1500 square feet of laboratory space, within the last year Encore Labs has doubled its work area. In order to meet the growing demand of the cannabis testing industry, they have added plans to once again double in size by the end of 2019, as well as open a second laboratory by the end of 2020.
The cannabis industry is growing exponentially, and the use of cannabis for medical purposes is being adopted across the nation. With this boom in cannabis consumers, there has been an increasing need for knowledge about the product.
The role of testing labs has become crucial to the process, which makes owning and operating a lab more lucrative. Scientists testing for potency, heavy metals, pesticides, residual solvents, moisture, terpene profile, microbial and fungal growth, and mycotoxins/aflatoxins are able to make meaningful contributions to the medical industry by making sure products are safe, while simultaneously generating profits and a return on investment.
Here are the key testing instruments you need to conduct these critical analyses. Note that cannabis analytical testing requirements may vary by state, so be sure to check the regulations applicable to the location of your laboratory.
The most important component of cannabis testing is the analysis of cannabinoid profiles, also known as potency. Cannabis plants naturally produce cannabinoids that determine the overall effect and strength of the cultivar, which is also referred to as the strain. There are many different cannabinoids that all have distinct medicinal effects. However, most states only require testing and reporting for the dry weight percentages of delta-9-tetrahydrocannabinol (Δ9-THC) and cannabidiol (CBD). It should be noted that delta-9-tetrahydrocannabinolic acid (Δ9-THCA) can be converted to THC through oxidation with heat or light.
For potency testing, traditional high-performance liquid chromatography (HPLC) is recommended and has become the gold standard for analyzing cannabinoid profiles. Look for a turnkey HPLC analyzer that delivers a comprehensive package that integrates instrument hardware, software, consumables and proven HPLC methods.
Heavy Metal Testing
Different types of metals can be found in soils and fertilizers, and as cannabis plants grow, they tend to draw in these metals from the soil. Heavy metals are a group of metals considered to be toxic, and the most common include lead, cadmium, arsenic and mercury. Most labs are required to test and confirm that samples are under the allowable toxic concentration limits for these four hazardous metals.
Heavy metal testing is performed by inductively coupled plasma mass spectrometry (ICP-MS). ICP-MS uses the different masses of each element to determine which elements are present within a sample and at what concentrations. Make sure to include accompanying software that provides assistant functions to simplify analysis by developing analytical methods and automatically diagnosing spectral interference. This will provide easy operation and analytical results with exceptionally high reliability.
To reduce running costs, look for a supporting hardware system that reduces the consumption of argon gas and electricity. For example, use a plasma ignition sequence that is optimized for lower-purity argon gas (i.e., 99.9% argon as opposed to more expensive 99.9999%).
The detection of pesticides in cannabis can be a challenge. There are many pesticides that are used in commercial cannabis grow operations to kill the pests that thrive on the plants and in greenhouses. These chemicals are toxic to humans, so confirming their absence from cannabis products is crucial. The number of pesticides that must be tested for varies from state to state, with Colorado requiring only 13 pesticides, whereas Oregon and California require 59 and 66 respectively. Canada has taken it a step further and must test for 96 pesticides, while AOAC International is developing methods for testing for 104 pesticides. The list of pesticides will continue to evolve as the industry evolves.
Testing for pesticides is one of the more problematic analyses, possibly resulting in the need for two different instruments depending on the state’s requirements. For a majority of pesticides, liquid chromatography mass spectrometry (LCMS) is acceptable and operates much like HPLC but utilizes a different detector and sample preparation.
Pesticides that do not ionize well in an LCMS source require the use of a gas chromatography mass spectrometry (GCMS) instrument. The principles of HPLC still apply – you inject a sample, separate it on a column and detect with a detector. However, in this case, a gas (typically helium) is used to carry the sample.
Look for a LC-MS/MS system or HPLC system with a triple quadrupole mass spectrometer that provides ultra-low detection limits, high sensitivity and efficient throughput. Advanced systems can analyze more than 200 pesticides in 12 minutes.
For GCMS analysis, consider an instrument that utilizes a triple quadrupole mass spectrometer to help maximize the capabilities of your laboratory. Select an instrument that is designed with enhanced functionality, analysis software, databases and a sample introduction system. Also include a headspace autosampler, which can also be used for terpene profiles and residual solvent testing.
Residual Solvent Testing
Residual solvents are chemicals left over from the process of extracting cannabinoids and terpenes from the cannabis plant. Common solvents for such extractions include ethanol, butane, propane and hexane. These solvents are evaporated to prepare high-concentration oils and waxes. However, it is sometimes necessary to use large quantities of solvent in order to increase extraction efficiency and to achieve higher levels of purity. Since these solvents are not safe for human consumption, most states require labs to verify that all traces of the substances have been removed.
Testing for residual solvents requires gas chromatography (GC). For this process, a small amount of extract is put into a vial and heated to mimic the natural evaporation process. The amount of solvent that is evaporated from the sample and into the air is referred to as the “headspace.” The headspace is then extracted with a syringe and placed in the injection port of the GC. This technique is called full-evaporated technique (FET) and utilizes the headspace autosampler for the GC.
Look for a GCMS instrument with a headspace autosampler, which can also be used for pesticide and terpene analysis.
Terpene Profile Testing
Terpenes are produced in the trichomes of the cannabis leaves, where THC is created, and are common constituents of the plant’s distinctive flavor and aroma. Terpenes also act as essential medicinal hydrocarbon building blocks, influencing the overall homeopathic and therapeutic effect of the product. The characterization of terpenes and their synergistic effect with cannabinoids are key for identifying the correct cannabis treatment plan for patients with pain, anxiety, epilepsy, depression, cancer and other illnesses. This test is not required by most states, but it is recommended.
The instrumentation that is used for analyzing terpene profiles is a GCMS with headspace autosampler with an appropriate spectral library. Since residual solvent testing is an analysis required by most states, all of the instrumentation required for terpene profiling will already be in your lab.
As with residual solvent testing, look for a GCMS instrument with a headspace autosampler (see above).
Microbe, Fungus and Mycotoxin Testing
Most states mandate that cannabis testing labs analyze samples for any fungal or microbial growth resulting from production or handling, as well as for mycotoxins, which are toxins produced by fungi. With the potential to become lethal, continuous exposure to mycotoxins can lead to a buildup of progressively worse allergic reactions.
LCMS should be used to qualify and identify strains of mycotoxins. However, determining the amount of microorganisms present is another challenge. That testing can be done using enzyme linked immunosorbent assay (ELISA), quantitative polymerase chain reaction (qPCR) or matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS), with each having their advantages and disadvantages.
For mycotoxin analysis, select a high-sensitivity LC-MS/MS instrument. In addition to standard LC, using an MS/MS selective detector enables labs to obtain limits of detection up to 1000 times greater than conventional LC-UV instruments.
For qPCR and its associated needs, look for a real-time PCR amplification system that combines thermal cyclers with optical reaction modules for singleplex and multiplex detection of fluorophores. These real-time PCR detection systems range from economical two-target detection to sophisticated five-target or more detection systems. The real-time detection platform should offer reliable gradient-enabled thermal cyclers for rapid assay optimization. Accompanying software built to work with the system simplifies plate setup, data collection, data analysis and data visualization of real-time PCR results.
Moisture Content and Water Activity Testing
Moisture content testing is required in some states. Moisture can be extremely detrimental to the quality of stored cannabis products. Dried cannabis typically has a moisture content of 5% to 12%. A moisture content above 12% in dried cannabis is prone to fungal growth (mold). As medical users may be immune deficient and vulnerable to the effects of mold, constant monitoring of moisture is needed. Below a 5% moisture content, the cannabis will turn to a dust-like texture.
The best way to analyze the moisture content of any product is using the thermogravimetric method with a moisture balance instrument. This process involves placing the sample of cannabis into the sample chamber and taking an initial reading. Then the moisture balance instrument heats up until all the moisture has been evaporated out of the sample. A final reading is then taken to determine the percent weight of moisture that was contained in the original sample.
Look for a moisture balance that offers intuitive operation and quick, accurate determination of moisture content. The pan should be spacious enough to allow large samples to be spread thinly. The halogen heater and reflector plate should combine to enable precise, uniform heating. Advanced features can include preset, modifiable measurement modes like automated ending, timed ending, rapid drying, slow drying and step drying.
Another method for preventing mold is monitoring water activity (aW). Very simply, moisture content is the total amount of water available, while water activity is the “free water” that could produce mold. Water activityranges from 0 to 1. Pure water would have an aW of 1.0. ASTM methods D8196-18 and D8297-18 are methods for monitoring water activity in dry cannabis flower. The aW range recommended for storage is 0.55 to 0.65. Some states recommend moisture content to be monitored, other states monitor water activity, and some states such as California recommend monitoring both.
As you can see, cannabis growers benefit tremendously from cannabis testing. Whether meeting state requirements or certifying a product, laboratory testing reduces growers’ risk and ensures delivery of a quality product. As medicinal and recreational cannabis markets continue to grow, analytical testing will ensure that consumers are receiving accurately
labeled products that are free from contamination. That’s why it is important to invest in the future of your cannabis testing lab by selecting the right analytical equipment at the start of your venture.
Good news came to patients using medical cannabis in Arizona earlier this week: Lawmakers in Arizona unanimously passed SB1494 through the state’s House and Senate, the bill requiring mandatory lab testing for medical cannabis products. Arizona Governor Doug Ducey is expected to sign the bill and has ten days to do so.
When Governor Ducey signs the bill into law it will mark the first time since the state legalized medical cannabis in 2011 that a measure to protect patient safety via lab testing will be implemented. According to the bill, beginning November 1, 2020, all cannabis products shall be tested prior to sales “to determine unsafe levels of microbial contamination, heavy metals, pesticides, herbicides, fungicides, growth regulators and residual solvents and confirm the potency of the marijuana to be dispensed,” (Page 6, Section 36-2803).
The bill requires dispensaries to provide test results to patients immediately upon request. Dispensaries need to display a sign notifying patients of their right to see “certified independent third-party laboratory test results for marijuana and marijuana products for medical use,” according to the text of the bill (Page 7, Section 36-2803.01).“There will have to be some serious planning, but other states have achieved this and we can too.”
Under the new bill, the Arizona Department of Health Services will adopt rules to certify and regulate labs, establishing requirements like health and safety protocols, mandatory quality assurance program and standards, chain of custody and sampling policies, adequate records, accreditation, proficiency testing, among other requirements (Page 6-7, Section 36-2803).
Ryan Treacy, co-founder of the Arizona Cannabis Laboratory Association (ACLA) and CEO/Founder of C4 Laboratories, says this is a major turning point for Arizona’s cannabis industry. “We have been devoid of regulations with regard to testing the entirety of the program since it was legalized; This will be a significant change,” says Treacy. “Now patients can make sure they are getting a safe and clean product and getting exactly what they paid for.”
For those in the know when it comes to cannabis testing in the United States, the new requirements will look very similar to other states with testing requirements. One particularly unique aspect of the new program, however, is the establishment of a “Medical Marijuana Testing Advisory Council,” made up of stakeholders representing different interests in Arizona’s cannabis industry. Members of the council will include representatives from dispensaries, labs, cultivators, concentrate producers, edibles producers, as well as registered patients, caregivers, a representative from the Arizona Department of Public Safety, a licensed health care provider and “any other members deemed necessary by the director,” reads the text of the bill (page 16, Section 36-2821).
“Other states like California have complained about detection limits, while Arizona is taking a unique approach with an advisory council with stakeholders in the cannabis industry,” says Treacy. “So that when the Department of Health Services promulgates rules, they are taking into account the challenges in the cannabis industry specifically. We have a chance to do this right and avoid pitfalls we’ve seen in other states.”
One problem worth mentioning for Arizona’s cannabis industry: Dispensaries have not been required to test products for patients since medical cannabis was legalized back in 2011. That means many producers could be very used to operating procedures that don’t account for lab testing. With mandatory lab testing, some producers may be behind the curve when it comes to mitigating contamination.
According to Treacy, this could disrupt the supply chain a little bit. “When testing becomes mandatory in November 2020, dispensaries will need a full panel of tests performed on their samples,” says Treacy. “With the entire market now required to complete a full panel in depth analysis on each product, product testing will become a more time-consuming stop in the supply chain. So companies will need to work that into their plan to meet regulation requirements to prevent a bottleneck and maintain patients’ access to their cannabis medicine.”
Arizona has a chance to prevent that type of bottleneck seen in states that implemented testing requirements, like California for example. “When you have a habitual history of not testing products, it can be very hard to change, which adds to Arizona’s challenges,” says Treacy. “We need to make sure this does not affect access for patients and the ability of the industry to continue to flourish and grow.”
While Treacy thinks the transition will be difficult for some, it’s absolutely necessary for Arizona’s patients to access clean and safe medicine. “There will have to be some serious planning, but other states have achieved this and we can too.”
According to a press release published today, Emerald Scientific awarded PerkinElmer five badges for The Emerald Test, a bi-annual Inter-Laboratory Comparison and Proficiency Test (ILC/PT) program. Awarding the badges for Perkin Elmer’s instruments and testing methods affirms their ability to accurately detect pesticides, heavy metals, residual solvents, terpenes and potency in cannabis.
According to Greg Sears, vice president and general manager of Food, Chromatography & Mass Spectrometry, Discovery & Analytical Solutions at PerkinElmer, they are the only instrument manufacturer to receive all five accolades. “To date, PerkinElmer is the only solutions provider to successfully complete these five Emerald Scientific proficiency tests,” says Sears. “The badges underscore our instruments’ ability to help cannabis labs meet the highest standards available in the industry and effectively address their biggest pain point: Navigating diverse regulations without compromising turnaround time.”
The instruments used were PerkinElmer’s QSight 220 and 420 Triple Quad systems, which are originally designed for accurate and fast detection/identification of “pesticides, mycotoxins and emerging contaminants in complex food, cannabis and environmental samples,” reads the press release. They also used their ICP-MS, GC/MS and HPLC systems for the badges.
PerkinElmer says they developed a single LC/MS/MS method using their QSight Triple Quad systems, which helps labs test for pesticides and mycotoxins under strict regulations in states like California and Oregon. They performed studies that also confirm their instruments can help meet Canada’s testing requirements, which set action limits nearly 10 times lower than California, according to the press release.
Editor’s Note: The following is based on research and studies performed in their Santa Cruz Lab, with contributions from Mikhail Gadomski, Lab Manager, Ryan Maus Technical Services Analyst, Laurie Post, Director of Food Safety & Compliance, and Charles Deibel, President Deibel Cannabis Labs.
Heavy metals are common environmental contaminants resulting from human industrial activities such as mining operations, industrial waste, automotive emissions, coal fired power plants and farm/house hold water run-off. They affect the water and soil, and become concentrated in plants, animals, pesticides and the sediments used to make fertilizers. They can also be present in low quality glass or plastic packaging materials that can leach into the final cannabis product upon contact. The inputs used by cultivators that can be contaminated with heavy metals include fertilizers, growing media, air, water and even the clone/plant itself.
The four heavy metals tested in the cannabis industry are lead, arsenic, mercury and cadmium. The California Bureau of Cannabis Control (BCC) mandates heavy metals testing for all three categories of cannabis products (inhalable cannabis, inhalable cannabis products and other cannabis and cannabis products) starting December 31, 2018. On an ongoing basis, we recommend cultivators test for the regulated heavy metals in R&D samples any time there are changes in a growing process including changes to growing media, cannabis strains, a water system or source, packaging materials and fertilizers or pesticides. Cultivators should test the soil, nutrient medium, water and any new clones or plants for heavy metals. Pre-qualifying a new packaging material supplier or a water source prior to use is a proactive approach that could bypass issues with finished product.
The best approach to heavy metal detection is the use of an instrument called an Inductively Coupled Plasma Mass Spectrometry (ICP-MS). There are many other instruments that can test for heavy metals, but in order to achieve the very low detection limits imposed by most states including California, the detector must be the ICP-MS. Prior to detection using ICP-MS, cannabis and cannabis related products go through a sample preparation stage consisting of some form of digestion to completely break down the complex matrix and extract the heavy metals for analysis. This two-step process is relatively fast and can be done in a single day, however, the instruments used to perform the digestion are usually the limiting step as the digesters run in a batch of 8-16 samples over a 2-hour period.
Only trace amounts of heavy metals are allowed by California’s BCC in cannabis and cannabis products. A highly sensitive detection system finds these trace amounts and also allows troubleshooting when a product is found to be out of specification.
For example, during the course of testing, we have seen lead levels exceed the BCC’s allowable limit of 0.5 ppm in resin from plastic vape cartridges. An investigation determined that the plastic used to make the vape cartridge was the source of the excessive lead levels. Even if a concentrate passes the limits at the time of sampling, the concern is that over time, the lead leached from the plastic into the resin, increasing the concentration of heavy metals to unsafe levels.
Getting a Representative Sample
The ability to detect trace levels of heavy metals is based on the sample size and how well the sample represents the entire batch. The current California recommended amount of sample is 1 gram of product per batch. Batch sizes can vary but cannot be larger than 50 pounds of flower. There is no upper limit to the batch sizes for other inhalable cannabis products (Category II).
It is entirely likely that two different 1 gram samples of flower can have two different results for heavy metals because of how small a sample is collected compared to an entire batch. In addition, has the entire plant evenly collected and concentrated the heavy metals into every square inch of it’s leaves? No, probably not. In fact, preliminary research in leafy greens shows that heavy metals are not evenly distributed in a plant. Results from soil testing can also be inconsistent due to clumping or granularity. Heavy metals are not equally distributed within a lot of soil and the one small sample that is taken may not represent the entire batch. That is why it is imperative to take a “random” sample by collecting several smaller samples from different areas of the entire batch, combining them, and taking a 1 g sample from this composite for analysis.
Linger, P. J. Mussig, H. Fischer, J. Kobert. 2002. Industrial hemp (Cannabis sativa L.) growing on heavy metal contaminated soil: fibre quality and phytoremediation potential. Ind. Crops Prod. 11, 73–84.
Manufacturers of cannabis products need a program tailored to the cannabis industry that helps assure the safety of cannabis products with respect to known hazards such as pesticides, residual solvents, microbial impurities, heavy metals and mycotoxins. Deibel Cannabis Laboratories has developed a course that that will teach those manufacturing cannabis products how to manage known product safety hazards using a Hazard Analysis and Critical Control Point (HACCP) system.
HACCP has a long history of use in the food industry based on preventing potential hazards from occurring rather than reacting to issues when they arise. This program was started in the US but is globally recognized, used by food companies around the world to help produce safe products for consumers. Deibel Cannabis Laboratories applies the same prevention based system of HACCP to the creation of safe and wholesome cannabis goods whether they be edible, medicinal or topical. They also explore ways cultivators can use HACCP principles in their operation.12
Deibel Labs was founded by Dr. Robert Deibel in the 1970’s. Dr. Deibel is one of the original pioneers of HACCP, expanding the program from its original three HACCP principles to the seven principles we recognize today. Dr. Deibel developed the first “HACCP Short Course,” teaching this prevention-based program to food industry leaders in the 1970s.
According to Charles Deibel, president of Deibel Labs, this is an important step for the cannabis space. “Deibel Labs is proud to continue in our historic role as leaders in HACCP training by providing the cannabis industry with a training course developed by Deibel Labs associates who are International HACCP Alliance accredited lead instructors with years of experience in crafting and implementing HACCP plans for the food industry.”
They are launching a pilot two-day Cannabis HACCP Class to select clients at the end of January in Santa Cruz, CA. The full Cannabis HACCP course schedule for 2019 is currently in development. Accreditation by the HACCP Alliance is expected by early January, assuring that a standardized and internationally recognized training curriculum is provided by accredited instructors.
The course is forward-thinking, anticipating that sometime in the near future cannabis manufacturers will be required to control and document the safe production, handling and preparation of products according to state or even federal regulatory standards. Participants will be able to develop their own model HACCP program in an interactive group learning environment.
Understand how Prerequisite Programs provide the foundation on which HACCP programs are built including GMPs, Sanitation and Pest Control Programs
Be able to identify where and how product safety problems can occur using a Hazard Analysis that considers Biological, Chemical and Physical Hazards
Gain the skills, knowledge, and tools necessary to develop effective Critical Controls, formulate corrective actions, conduct program verification and validation activities
Learn how to document activities and maintain records
Stay tuned for more information on when the 2019 course schedule is announced and how to register.
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