Under state law, marijuana is generally defined as all parts of the Cannabis plant, whether growing or not, with a THC concentration greater than 0.3 percent on a dry-weight basis.
THC concentration references the percent of delta-9 tetrahydrocannabinol content per dry weight of any part of the Cannabis plant, or per volume or weight of marijuana product, or the combined percent of delta-9 tetrahydrocannabinol and tetrahydrocannabinolic acid in any part of the Cannabis plant, regardless of moisture content.
Technical changes are made throughout the Revised Code of Washington replacing the term "marijuana" with the term "cannabis."