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How long do drugs remain in your system?

March 31, 2010 in Employee Drug Testing Information

There is no simple answer as to how long drugs will remain in your system, since the answer is influenced by the specific drug half-life, intensity of the usage, method of usage, length of usage, tolerance, fluid intake, body size, body fat, metabolism, andthe specific range which the drug testing lab uses to signify a positive for drug use. But the following table provides some general guidelines for the amount of time a drug can be detected by most standard drug tests:

Drug Detection Time
Alcohol 6–24 hours
Amphetamines 2–3 days
Barbituates 1 day to 3 weeks
Benzodiazepines 3–7 days
Cocaine 2–5 days
Codeine 3–5 days
Euphorics (MDMA, Ecstasy) 1–3 days
LSD 1-4 days
Marijuana (THC) 7–30 days
Methadone 3–5 days
Methaqualone 14 days
Opiates 1-4 days
Phencyclidine (PCP) 2–4 days
Steroids (anabolic) 14–30 days

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