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Drug Testing Detection Rates and Times

The following is a chart showing the minimum and maximum detection time, on average, that certain drugs stay in a person's system. *

Substance	Minimum	Maximum
Alcohol		24 hours
Amphetamines (AMP)	2-7 hours	2-4 days
Barbiturates (BAR)	4 to 6 hours	4.5 days for short acting 10 days for long-acting
Benzodiazepines (BZO)	4 to 6 hours	up to 10 days
Buprenorphine (BUP)	4 to 6 hours	up to 10 days
Cannabinoids (THC)	2 Hours	Infrequent user: up to 10 days Chronic user: 6 weeks
Cocaine Metabolite (COC)	1.25 - 4 hours	2-3 days
Cotinine (NIC)		30 days or longer
Methadone (MTD)	2-7 hours	2-4 days
Methamphetamine (MAMP)	2-7 hours	2-4 days
Methaqualone		Up to 10 days
Methylenedioxymethamphetamine (MDMA)	2-4 hours	1-3 days
Opiates (OPI)	2.5 hours	2-3 days
Oxycodone (OXY)	2.5 hours	2-3 days
Phencyclidine (PCP)	4-6 hours	7-14 days
Propoxyphene	4-6 hours	7-14 days
Tricyclic Antidepressants (TCA)	4-6 hours	up to 10 days

* These values are based on an average person.

Some people may metabolize drugs at a different rate and, thus, have slightly different time frames as to how long the drug will stay in the body.

Factors which affect metabolism:

amount and frequency of use
the body's rate of metabolism
your body mass (size)
your age
your tolerance to drugs or alcohol
your overall health
how drugs are taken
(swallowed, inhaled, smoked, injected)

Results may also very depending on the type of drug testing used.