Cocaine Testing for Charge "fake cocaine"

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I posted this elsewhere, but didn't get any replies, so here we go:

My friend did a line of charge a little over four days ago, and she tested positive for crack today... is this possible? I thought it wasn't detectable in drug tests.

 

[Captain.Heroin]

Sorry, Bluelight doesn't discuss drug tests. I'm going to have to close this thread.

Drug tests are notoriously unreliable though.