3 ms·

> Even if the driver had smoked cannabis one minute before the traffic stop, the driver’s blood plasma THC level would have fallen 80%-90% in the first hour aft

> Even if the driver had smoked cannabis one minute before the traffic stop, the driver’s blood plasma THC level would have fallen 80%-90% in the first hour after ingestion, and even more so after two and a half hours. Can you source this claim from your front page? And if it is correct, how are you making sure the police correlate impairment with THC levels correctly? If someone smoked 2-3 hours before driving, wouldn't even your device fail in this case? What thresholds are you using?

SannTek 7y 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.