How long are drugs detectable in your system?

How long after last use are drugs detectable?

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.

Oral Fluid: Very recent use up to 2 days, depending on the drug
Blood: Most drugs are non-detectable after five to 48 hours, depending on the drug. A good rule of thumb is only use blood for drug testing if the person is impaired at the time of collection.
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.
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
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1 Response to “How long are drugs detectable in your system?”


  1. 1 corporation offshore May 18, 2011 at 2:53 pm

    ………Yes environmental exposure versus ingestion must be resolved when interpreting drug tests using nails……………. ………Drugs can be identified in nails up to eight months after the last usage. ………Drugs are distributed via the blood supply to the nail cells and the nail bed.


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