A member asked:

How good has drug testing gotten for new drugs now?

A doctor has provided 1 answer

Very: Drug testing is quite sensitive and highly specific. Most labs run very sensitive screens to identify major classes of drugs then when they find a positive they run a highly specific gas chromatograph / mass spectrometer. This test uniquely identifies the parent compound and its metabolites. If the sample chain of custody is good, there is only one explanation for a positive result.

Answered 7/20/2018

5.8k views

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