If you’ve ever found yourself on the wrong side of the law, there’s a good chance that you’ve encountered a field drug test before. It’s what the police use to test any suspicious looking substances you might have in your possession to see if they’re illegal drugs. And they are of course admissible in a court of law. What the cops won’t tell you, however, is that these drug test kits are incredibly fallible, and there are plenty of innocent substances that can cause them to produce a false positive.
Several years ago the U.S. Marijuana Policy Project did a demonstration with the kits that the police use to put people in jail. The results were both enlightening and horrifying.