Drugs Detection Period

Approximate values for detection periods

Substance	Urine	Hair	Blood / Oral Fluid
Alcohol	6–24 hours[4] Note: Alcohol tests may measure ethyl glucuronide, which can stay in urine for up to 80 hours	up to 2 days	12–24 hours
Amphetamines(except methamphetamine)	1 to 3 days[5]	up to 90 days	12 hours
Methamphetamine	3 to 5 days[6]	up to 90 days	1–3 days[6]
MDMA (Ecstasy)	3 – 4 days	up to 90 days	3 – 4 days
Barbiturates(except phenobarbital)	1 day	up to 90 days	1 to 2 days
Phenobarbital	2 to 3 weeks[7]	up to 90 days	4 to 7 days
Benzodiazepines	Therapeutic use: up to 7 days. Chronic use (over one year): 4 to 6 weeks	up to 90 days	6 to 48 hours
Cannabis	Infrequent users: 7-10 Days; Heavy users: up to 30 days;[8][9]	up to 90 days[8]	2–3 days in blood, up to 2 weeks in blood of heavy users[8] However, it depends on whether actual THC or THC metabolites are being tested for, the latter having a much longer detection time than the former. THC (found in marijuana) may only be detectable in saliva/oral fluid for 2–24 hours in most cases.
Cocaine	2 to 5 days (with exceptions for heavy users who can test positive up to 7–10 days, and individuals with certain kidney disorders)	up to 90 days	2 to 10 days
Codeine	2 to 3 days
Cotinine (a breakdown product ofnicotine)	2 to 4 days	up to 90 days	2 to 4 days
Morphine	2 to 4 days	up to 90 days	1 – 3 days
Tricyclic antidepressants(TCA's)	7 to 10 days[10]	Undetectable[11]	Detectable but dose relationship not established[12]
LSD	2–24 hours	up to 4 days[13]	2 to 4 days
Methadone	7 to 10 days	up to 90 days	24 hours
Steroids	3 to 30 days
PCP	3 to 7 days for single use; up to 30 days in chronic users[14]	up to 90 days	1 to 3 days[14]