Quality Control in the World of Cannabis

October 24, 2019
Abstract / Synopsis: 

The cannabis industry is an emerging field with many unknowns. With unknowns comes uncertainty, and in a world where cannabis is attempting to break the negative stigmatism which it has been given, that uncertainty can be dangerous. Cannabis, whether for medicinal or recreational use, has testing requirements that it must meet, however, until recently most states have not required quality control to support independent laboratory testing results. Strict quality control requirements should have been mandated in all legal markets years ago, being that it is essential for validating testing results. Laboratories who are responsible for testing cannabis, no matter the matrix, should be required to run quality control to show that their results are reproducible, reliable, and defensible. This article covers the importance of quality control, how to implement it, and what cannabis cultivators, processors, retailers, and consumers should look for on laboratory reports and certificates of analysis.

Quality control practices should be the backbone of any analytical laboratory. However, because cannabis testing is still considered a relatively new analytical service, many inexperienced laboratories who do not implement quality control practices still exist. This will change as the industry matures and as more rules regarding quality control continue to be implemented. The environmental industry provides an excellent example of how analytical laboratories should implement quality control practices and what requirements are expected. In some states such as New York, Texas, and Florida, the National Environmental Laboratory Accreditation (NELAC) Institute (TNI) has a set of rules and standards which laboratories must abide by; these rules are laid out in “TNI Standard – Environmental Laboratory Sector” (1). Many of the requirements outlined in the TNI document are adapted from the widely known International Organization for Standardization and the International Electrotechnical Commission (ISO/IEC) 17025 standard (2). Both of these standards outline the requirements for developing and implementing a quality system.

With the rapid increase in the number of states legalizing either medicinal or recreational cannabis, steps need to be taken to ensure that the laboratories analyzing cannabis products are producing reliable data. Before laboratories start processing samples, they should develop a quality system that ensures they are qualified to be performing the analytical analyses which they are reporting results for. The minimum requirement for certification among cannabis laboratories should be ISO/IEC 17025:2017. This standard provides thorough and concise rules and regulations for analytical laboratories. Before creating standard operating procedures, validating methodologies, and performing analyses, laboratories should first develop an ISO/IEC approved quality system. This will ensure that any practices developed from that point on will have a solid foundation to be built from.

Building a quality system requires a significant amount of time and effort. A great amount of forethought must be considered when developing this system because it will be the basis of all procedures that are carried out through the laboratory. Per ISO/IEC 17025:2017, a “laboratory shall establish, document, implement, and maintain a management system that is capable of supporting and demonstrating consistent achievement of the requirements of this document and assuring the quality of laboratory results” (2). A cannabis laboratory should develop their quality systems based on the information required by Option A within the document, which includes “addressing at a minimum: management system documentation; control of management system documents; control of records; actions to address risk and opportunities; improvement; corrective actions; internal audits; and management reviews.” By doing this, the laboratory will be able to show competence in their abilities to perform analyses that are developed under this system. By creating a standard across the board that all analytical cannabis laboratories should follow, such as ISO/IEC 17025:2017, the industry will be able to take steps towards standardizing the results that are obtained from laboratory to laboratory.

Once a quality system has been established, quality control requirements and guidelines can be outlined within the system. ISO/IEC 17025:2017 “Section 7.2 – Selection, Verification and Validation of Methods” outlines the requirements that laboratories should follow when developing or implementing any analytical method. Currently, there are no standard methodologies that all cannabis laboratories must follow when processing samples, and though this is a bigger issue that also needs to be resolved, one way to limit variability in data across laboratories is to require that these standards are followed. By doing this, method validation for the analyses being performed by the laboratory will become a requirement. After methodology is properly validated and a standard operating procedure has been established, the laboratory should then begin processing samples for that analysis.

At this point, the laboratory should implement standard quality control with each sample batch that is processed. This quality control validates the results and shows that the laboratory is able to perform the analyses with accuracy and precision. Currently, there is no set quality control required for analytical cannabis laboratories across the board. However, some states are implementing guidelines that outline requirements for quality control. Florida, for example, has included Standards for Marijuana Testing Laboratories as part of the draft for “Rule 64-4.0XX” which will fall under “64-4.016 – Marijuana Testing Laboratories” (3,4). This rule outlines all of the quality control that must be included with each batch of processed samples. The basis of quality control falls on the fact that the “quality control samples shall be analyzed in the same manner as test samples for validation purposes.” This rule ensures that the samples and the quality control are treated the same and taken through the entire process from start to finish. Currently, the draft rule for Florida states that all batches analyzed should include a method blank, laboratory fortified blank, matrix spike, laboratory fortified blank duplicate, and a matrix spike duplicate. Though the requirements may change before a final rule is issued, it is a starting point for ensuring the validity of data being produced by cannabis testing laboratories within the state.

  1. The NELAC Institute, 2016, Environmental Laboratory Sector, Volume 1: Management and Technical Requirements for Laboratories Performing Environmental Analysis.
  2. International Standard, 2017, ISO/IEC 17025: General Requirements for the Competence of Testing and Calibration Laboratories.
  3. Florida Department of Health, March 2018, Draft Rule 64-4.0xx - “Standards for Marijuana Testing Laboratories.”
  4. Florida Department of Health, March 2018, Draft Rule 64-4.016 - “Marijuana Testing Laboratories.”
  5. U.S. Environmental Protection Agency, 1996c, Method 8260B—Volatile organic compounds by gas chromatography/mass spectrometry (GC/MS).

Jini L. Curry is the Laboratory Director at Modern Canna in Lakeland, Florida. Christian Beauchemin is the Lead Analyst at Modern Canna. George Fernandez is the CEO of Modern Canna. Direct correspondence to: [email protected].

How to Cite This Article 

J.L. Curry, C. Beauchemin, and G. Fernandez, Cannabis Science and Technology 2(5), 52-55 (2019).