This ER doctor is about to launch the first marijuana breathalyzer, and it could completely upend how we do drug testing - Business Insider

To use Hound Labs' device, someone blows into it for roughly a minute. Then, the device returns a positive or negative result for the presence of THC. California startup Hound Labs is getting ready to roll out the world's first marijuana and alcohol breathalyzer...
https://www.businessinsider.com/marijuana-breathalyzer-startup-er-doctor-sheriff-vc-hound-labs-2019-2