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The one thing we do know for sure is when you’re collecting a sample off of a human being, you want to go where the most scent is produced. That is the head, the pits, the groin and the feet. Given those options, I went with feet, we collected some socks from people willing to donate socks, and we taught the dogs, by smelling the socks, which ones were the Covid socks and they picked it up very quickly.