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by SannTek 2494 days ago
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.