In order to comply with the quality assurance testing in WAC 246-70-050, pesticide screening by a certified third-party lab approved by the Washington State Liquor and Cannabis Board (WSLCB) must be completed at the time of harvest for all marijuana flowers, trim, leaves, or other plant matter. Pesticide screening and screening for pyrethrins and piperonlyl butoxide (PBO) must also be completed for each batch of finished concentrates and extracts.
The lab must screen for the following unapproved pesticides:
- Chlormequat chloride
- DDVP (Dichlorvos)
Refer to the Washington State Department of Agriculture (WSDA) website for standards regarding pesticide and fertilizer use for the production of marijuana in Washington.