Drug Detection Times

 

Table 1. Commonly abused drugs and their detection time in different types of samples.

SubstanceUrineHairBlood
Alcohol6 to 24 hrs (5 days with EtG)N/A12 hrs
THC/Marijuana (single use)1 to 3 daysUp to 90 days24 hrs
THC/Marijuana (habitual use)Up to 14 daysUp to 90 days2 days
Amphetamines (except meth)2 to 4 daysUp to 90 days12 hrs
Methamphetamine2 to 5 daysUp to 90 days24 hrs
Barbiturates (except phenobarbital)2 to 10 daysUp to 90 days1 to 2 da­­­ys
Phenobarbital7 to 14 daysUp to 90 days4 to 7 days
Benzodiazepines1 to 6 weeksUp to 90 daysN/A
Cannabis (single use)1 to 3 daysUp to 90 days24 hrs
Cannabis (habitual use)Up to 14 daysUp to 90 days2 days
Cocaine2 to 7 daysUp to 90 days24 hrs
Morphine2 to 4 daysUp to 90 days6 hrs
Heroin2 to 4 daysUp to 90 days6 hrs
LSD2 to 24 hoursUnknown0 to 3 hours
PCP7 to 14 daysUp to 90 days1 to 3 days
Codeine2 to 4 daysUp to 90 days12 hrs