Cannabis Use among Drivers Suspected of Driving Under the Influence or Involved in Collisions: Analysis of Washington State Patrol Data

The objectives of this study were to examine drivers involved in collisions and/or arrested for suspected driving under the influence (DUI), thereby documenting: the trends in THC involvement over time and in relation to the legalization of cannabis; the prevalence of THC alone and in combination with other potentially intoxicating drugs; the estimated time to blood draw under real world conditions; and the relationship between estimated time to blood draw and the level of THC detected.