How Far Back Does a Saliva Drug Test Go?


A drug test using saliva goes back about 12-24 hours. After this amount of time the drugs usually disappear. This type of test is usually only helpful where recent drug use needs to be detected.
1 Additional Answer
When doing an oral test for drug screening it can test from 6 hours after use to about a week. This is testing for alcohol, marijuana, and all the drugs.
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