About 3 days: Depending on the specific drug and the amount/dosage of the drug, oral testing can detect drugs from time of ingestion to about three days. However, other factors may play a role, for instance, food and other techniques used to increase the amount of saliva in your mouth can alter results. http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1579288.
Answered 4/10/2019
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