Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Cannabis Laboratory Quality Assurance Program: Exercise 2 Moisture Final Report



Chuck Barber, Colleen E. Bryan Sallee, Carolyn Burdette, Shaun Kotoski, Melissa M. Phillips, Walter Brent Wilson, Laura Wood


In 2020, NIST launched Cannabis Laboratory Quality Assurance Program (CannaQAP) to improve the comparability of the analytical measurements of cannabis and cannabis-derived products in forensic and cannabis (hemp and marijuana) testing laboratories. CannaQAP is an interlaboratory study mechanism that is similar to a proficiency testing scheme; however, the focus is towards education without assigning pass/fail grades to the anonymized participants. CannaQAP helps inform NIST about the current measurement capabilities of, and challenges faced by the analytical cannabis community. This in turn assists NIST in the design and characterization of cannabis reference materials (RMs). This study of Exercise 2 of CannaQAP focused on the determination of moisture in one hemp material provided by NIST. This report provides a detailed description of the results of this study. The wide range of moisture loss reported by participating laboratories using several different drying methods indicates the need for consistent hemp drying method(s) for accurate and precise measurements.
NIST Interagency/Internal Report (NISTIR) - 8449
Report Number


Cannabis, Cannabis Laboratory Quality Assurance Program (CannaQAP), hemp, moisture.


Barber, C. , Bryan Sallee, C. , Burdette, C. , Kotoski, S. , Phillips, M. , Wilson, W. and Wood, L. (2022), Cannabis Laboratory Quality Assurance Program: Exercise 2 Moisture Final Report, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online],, (Accessed May 18, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created November 29, 2022