A Justice Department research says states may need to “get away from that idea” that marijuana impairment can be tested based on the concentration of THC in a person’s system. Frances Scott, a physical scientist at the National Institute of Justice (NIJ) Office of Investigative and Forensic Sciences under DOJ, discussed the challenges of cannabis … Continue reading Justice Department Researcher Says ‘We May Need Better Tests’ For Marijuana Impairment, Questioning ‘Per Se’ THC Limits For Driving