Summary
"In November 2012, Washington voters passed Initiative-502 (I-502), legalizing retail cannabis sales and recreational cannabis use for adults 21 years and older. As with alcohol, the law provides two options for prosecuting impaired drivers: 1) demonstrating impairment through detailed observation notes, field test results, witness observations, or Drug Recognition Expert assessments; and 2) determining the suspect’s blood level for the drug is above the legal "per se" limit. I-502 established a per se level of 5ng/mL of active delta-9-tetrahydrocannabinol (Δ9-THC) in blood for cannabis-impaired driving. Δ9-THC is a psychoactive and impairing compound in cannabis.
The objectives of these analyses were to describe the estimated time to blood draw under real world conditions, and examine the relationship between estimated time to blood draw and the level of Δ9-THC detected."--Page 1.