Scientists Unveil Weed Breathalyzer, Launching Debate Over Next Steps : NPR
▻https://www.npr.org/2019/09/05/757882048/scientists-unveil-weed-breathalyzer-launching-debate-over-next-steps
With alcohol, you can figure out impairment by measuring the amount of alcohol in someone’s blood, which you can determine from a Breathalyzer using the “blood to breath,” or “partition,” ratio. Make that translation from breath to blood to brain, and you have a relatively accurate sense of how drunk someone is.
“So when it comes to these #marijuana breath tests, that’s the million-dollar question right now,” says Chris Halsor, a Denver lawyer who focuses on issues around legal #cannabis.
Is there a ratio that links the amount of #THC in someone’s breath to the amount in the person’s blood — and then to exactly how stoned that person is?
No, says Sejdic. The correlation “is basically missing, from a scientific point of view.”