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Cops bully a man into stopping and having his car searched at a checkpoint. Watch their reaction when they realize they are being filmed ~4:32.(r/videos)
I have often thought that a cop can easily say the dog smelled something, whether the dog did or not, as a pretext for a search. After all, it’s not like a defense attorney can subpoena a dog into court.
Also, it’s important to understand that cops are rewarded by making felony arrests–that’s how they are judged and promoted (source: www.amazon.com/Arrest-Proof-Yourself-Ex-Cop-Reveal…). Even if DUI check points are set up in good faith with the idea of catching drunk drivers, the individual officers know how they are evaluated and have an incentive to make any arrest. Searches for drugs are an easy way to get promotions since 1) it takes very little work to find drugs if you’re pulling over ever damn car on the road; 2) drug laws are so Draconian that in some jurisdictions even the smallest amount is a felony. Compare the ease of busting a kid with a joint in his car vs. the effort required to bust, say, an armed robber, rapist, or serial killer. Even if a rapist is pulled over, if he has not been identified by name and a warrant issued, a random search is unlikely to get him arrested. Even a shoplifter will run away if possible, and the cops will have to search for him, which requires effort, and may not even result in a felony arrest.