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- Dec 25, 2008
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One of my students is doing a clerkship at a substance abuse clinic, and mentioned that she had heard that fenantyl/norfenantyl traces (enough to show up on a screen) can show up even if a person hasn't used, via something like sharing a drink with someone who has recently used. My initial take was that this didn't sound legit, but I couldn't find anything in a quick lit search.