Urine tests are one of the most common & effective methods of drug screening available.  Many illicit substances and their metabolites are detectable in urine for 5 - 10 days.

Testing the blood for alcohol or drugs is very accurate, however it is more invasive than other methods used for testing.  Blood testing typically detects substance use that occurred within 2 to 12 hours of the test.

Hair drug tests have the longest detection period, and can typically detect drug use for up to 90 days.  This method of drug testing will not detect current intoxication, as drugs may not appear in the hair for 7-10 days after drug exposure.

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.