DOE - Cannabis Science Task Force Steering Committee (December 17, 2020) - Proficiency Testing Work Group - Presentation Washington State Department of Ecology (DOE) Source https://www.ezview.wa.gov/...ments/CannabisSTF/December%20PTW%20Presentation.pdf Published: Monday February 1, 2021 4:28 PM Replications Cannabis Observer Information Set Membership DOE - Cannabis Science Task Force Steering Committee (December 17, 2020) - Information Set