Drug tests detect the presence of certain drugs in a person’s system, usually in the form of urine, saliva, or hair samples. The amount of time that a drug test can detect drugs depends on the type of drug and the type of test used. Generally, urine drug tests can detect drugs for up to 3 days after last use, while saliva tests can detect drugs for up to 24-48 hours after last use. Hair tests can detect drugs for up to 90 days after last use.
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