Here is the source of the 80%-90% statistic: National Highway Traffic Safety Administration. Marijuana-Impaired Driving: A Report to Congress. July 2017. The a

Here is the source of the 80%-90% statistic: National Highway Traffic Safety Administration. Marijuana-Impaired Driving: A Report to Congress. July 2017. The approximate window for cannabis impairment is 2-3 hours. Our sensor is currently calibrated to align with that window. The current threshold is around 10 pg/mL, although more trials are required to make sure that is the correct number.