THC concentration.

RCW 46.04.586
in effect
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"THC concentration" means nanograms of delta-9 tetrahydrocannabinol per milliliter of a person's whole blood. THC concentration does not include measurement of the metabolite THC-COOH, also known as carboxy-THC. "THC concentration" means nanograms of delta-9 tetrahydrocannabinol per milliliter of a person's whole blood. THC concentration does not include measurement of the metabolite THC-COOH, also known as carboxy-THC.
Source: WA Statutes (Official Site)URL: https://app.leg.wa.gov/RCW/default.aspx?cite=46.04&full=trueFetched: 6/29/2026

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