I disagree with it being a baiting technique. The officers are actually trained that way.
I was hosting a party about 5-6 years ago, and without warning me, my roommate invited one of his high school friends over who happened to be a MN state trooper. We were playing some cards together, and I pulled out my one-hitter to have a toke. When I finished, he asked me to stick out my tongue. He looked at my tongue, and said "That's weird". After asking him what was so weird about my tongue, he said "I learned in training that you can tell if someone has smoked weed because their tongue will be green."
I thought that was really weird at the time, but having just found out the guys profession, I didn't feel like arguing with him. I did have to have a talk with my roommate later about inviting LEO's over without warning me. My roommate apologized and said that the two of them went way back, and there was no danger of his friend arresting me so he didn't even think about warning me. The off duty trooper honestly believed in the green tongue BS, and was just curious after watching me partake...
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