How far back does a mouth swab drug screen go?

Depending on the drug used, dose, and route of administration, a drug may be detected in oral fluid in less than one hour and remain detectable for five up to 48 hours after last use.

What is more accurate saliva or urine drug test?

Urine drugs tests can produce results that are greater than 99 percent accurate while saliva drug tests can yield an accuracy of 99 percent. Urine drug tests can detect a wider range of substances versus saliva, however.

Related Question how accurate is a mouth swab drug test

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