How long can a drug of abuse be monitored through urinalysis?

Most drug of abuse are cleared from urine within 2 to 3 days. Therefore, urine screening must be performed two to three times a week to effectively monitor use of illicit drug on continuing bases. The table below shows timeline for various drugs.

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

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