Approximate values for detection periods

Substance	Urine	Hair	Blood / Oral Fluid
Alcohol	6–24 hours [3]	up to 90 days	12–24 hours
Amphetamines (except meth)	1 to 3 days[4]	up to 90 days	12 hours
Methamphetamine	3 to 5 days[5]	up to 90 days	1–3 days[5]
MDMA (Ecstasy)	24 hrs	up to 90 days	25 hours
Barbiturates (except phenobarbital)	1 day	up to 90 days	1 to 2 days
Phenobarbital	2 to 3 weeks[6]	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	3 to 7 days, up to >30 days after heavy use and/or in users with high body fat [7]	up to 90 days [7]	Up to 24 hours
Cocaine	2 to 5 days with exceptions for certain kidney disorders	up to 90 days	2 to 5 days
Codeine	2 to 3 days
Cotinine (a break-down product of nicotine)	2 to 4 days	up to 90 days	2 to 4 days
Morphine	2 to 4 days	up to 90 days	1 – 3 days
Heroin	3 to 4 days[8]	up to 90 days	1– 2 days
LSD	24 to 72 hours (however tests for LSD are very uncommon)	up to 3 days[citation needed]	0 to 3 hours
Methadone	3 days	up to 97 days	24 hours
PCP	3 to 7 days for single use; up to 30 days in chronic users[9]	up to 90 days	1 to 3 days[9]