I have doubts about this. Patrol cars carry little vials to test substances found on a person or in a car. It’s been SOP for years.
Those field test kits aren’t worth crap. They was recently an article in the NYT about this. People are being railroaded into pleading guilty to crimes that they did not commit based on field tests that are often fudged and inconclusive and prosecutors that threaten defendants with extreme punishments if they don’t take the plea. Poor, ignorant and terrified defendants choose the lesser of two evils, go to jail for a few weeks, and wind up with a felony that dogs them for life. Our “justice system” has become a cruel mockery of the ideal most Americans assume exists.