"Collinsville police officer answering questions about drug-dog training is raising questions of whether his tactics amount to evidence tampering and possibly set up innocent motorists for unfair roadside searches later. Officer Michael Reichert explains in a recording posted online that officers sometimes planted or smeared illicit drugs on vehicles parked overnight at businesses or motels, to test the dogs’ abilities."

In video, Collinsville cop says he put drugs on random vehicles to test police dogs : Stltoday