Marijuana & driving: Experts struggle to find ways to measure, assess impairment

10/1/17–The number of fatal Washington crashes involving drivers with marijuana in their system rose to 79 last year — more than double that of 2012 when voters legalized its recreational use. However, experts caution the statistics focus only on fatal crashes and don’t provide a complete picture of the impact pot is having on road safety. No statewide data is kept on serious injury accidents involving marijuana because of reporting inconsistencies by local police agencies, according to the safety commission. Researchers are studying if current methods of testing for marijuana impairment and whether the current legal limit of THC in a person’s system is an accurate assessment of impairment. Read