This study, entitled "False Positives Equal False Justice," reveals that the NIK NarcoPouch 908/Duquenois-Levine Reagent field test kit, the most widely used field test for identifying marijuana, as well as the majority of other drug test kits used as the basis for arrest and prosecution by law enforcement have an unacceptably high rate of rendering false positives.

John Kelly is a researcher and author of "False Positives Equal False Justice."