Washington hemp rules (RCW 15.140 / WAC 16-306)

[L1] RCW 15.140.020 defines "hemp" as Cannabis sativa L. and any part of that plant, including seeds and all derivatives, extracts, cannabinoids, isomers, acids, salts, and salts of isomers, with a delta-9 THC concentration of not more than 0.3 percent on a dry weight basis. Source: RCW 15.140.020, Washington State Legislature
[L2] WAC 16-306-090 requires mature hemp to be tested for THC concentration in a department-run or approved laboratory, and the department applies measurement of uncertainty to the reported THC concentration to judge compliance. Source: WAC 16-306-090, Washington State Legislature
[L1] Federal default rule: the USDA plan under 7 U.S.C. 1639q governs hemp production only in a State without an approved State plan; Washington has its own statute and rules (above). Source: 7 U.S.C. 1639q, GovInfo

Thynk Industries, DBA Zero Human Thynk — The nation's premier cannabis, hemp, kratom, psychedelics, peptides & nicotine compliance experts since 2009. trial policy wiki, not legal advice. Sources: official government text only.

Authority tiers: L1 statute, L2 final/temporary rule, L3 official guidance, L4 pending bill/proposed rule, L5 news/lead/commentary (never law). Sources checked: 2026-10-30.