The answer depends on which drug; type of specimen; each person’s own metabolism; drug concentration and/or dosage; how often the drug was used; and the sensitivity of the testing procedure.
Hair:
Drugs stay in the hair, so detection is dependent on the length submitted for testing. A standard hair drug test is 1 ½”, or 90 days
Nails:
This includes Nail Clippings (from the tips of the nails) and Nail Shavings/Scrapings (from the surface of the nail). Nail clippings yield an approximate thirty (30) day timeframe, six (6) months prior to collection. Nail clippings and shavings yield up to a six (6) month timeframe
Urine:
May allow detection for several days, sometimes even more than a week. However, urine analysis does not generally permit any toxicological evaluation of drug impairment, merely drug use.