http://video.foxnews.com/#/v/4347398/dogs-sniff-out-problems-in-prison/?playlist_id=86856
Two dogs are used to search through a prison for cell phones snuck in by inmates. With only two dogs they have already found 52 cell phones in about a month.
How do they train these dogs to search for a small chemical substance in the phones? Also, how are inmates able to get these phones passed the security? How do you think they do it?
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