Scientists Lay the Groundwork for a Reliable Marijuana Breathalyzer(nist.gov)
nist.gov
Scientists Lay the Groundwork for a Reliable Marijuana Breathalyzer
https://www.nist.gov/news-events/news/2017/07/scientists-lay-groundwork-reliable-marijuana-breathalyzer
Seriously however, with the increase in social acceptance around the world, this is a necessary technology. Operating a vehicle in any mentally reduced state is a hazard to everyone around you.. And too many people seem to disregard the dangers when smoking pot.