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Years ago, I had a DEA guy search my bag while I was waiting for my train to arrive. He walked up to me with a big golden retriever, the dog sniffed around for a second, then the agent said the dog had 'alerted', please open the bag. He went through it and found nothing other than clothes and a hunting knife (this nearly 20 years ago, when no one cared if you had a knife on a train). I figure the dog didn't really alert. Instead, the agent saw a well dressed gringo in an Amtrak station in a really crappy neighborhood of El Paso and figured something wasn't right with that picture.
Now maybe the dog did really alert - perhaps he was trained to smell stainless steel and leather. The point is moot, though, because I have no idea what the body language cue is when a dog finds something. So I can see it being pretty tempting for cops to simply claim their dog smells something if they think someone looks like a likely bust...
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