Quote:

A cop once told me that 20% of the people who tell the truth fail,and that 20% of liars,pass. Any truth to that?



They have no way of knowing. You'd need to do careful double-blind testing to tell to eliminate test process bias and police labs are allergic to anything that doesn't let them influence test results when they "need" to.
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"If they can't picture me with a knife, forcing them to strip in an alley, I don't want any part of it. It's humiliating." - windsock