How long after using drugs, can they be detected in urine?

Each drug is cleared by the body at different rates. How soon a drug may be found in the urine and how long a person will screen or test positive depends on a number of factors, including how often the drug is taken, how the drugs were taken (swallowed, inhaled, smoked, or injected) as well as the age, weight, diet, and metabolic rate of the user.

Detection Times Target Drug            Minimum              Maximum

(AMP) Amphetamine                         2 - 7 hours             2 - 4 days

(BAR) Barbiturates                            4 - 6 hours              Up to 10 days for long-acting Barbiturates

(BZO) Benzodiazepines                     4 - 6 hours             Up to 10 days

(COC) Cocaine                                 1.25 to 4 hours         2 - 3 days

(THC) Marijuana                                2 hours                  Up to 40 days*

(MTD) Methadone                              4 hours                  Up to 3 days

(mAMP) Methamphetamine                2 - 7 hours              2 - 4 days

(MDMA) Methylenedioxymethamphetamine                                                                  Ecstasy                                                2 - 4 hours              1 - 3 days

(OPI) Opiates                                       2.5 hours                2 - 3 days

(PCP) Phencyclidine                          4 - 6 hours              7 - 14 days

(TCA) Tricyclic Antidepressants         4 - 6 hours              Up to 10 days

*Sometimes longer depending on smoking pattern

Please refer to this guide as a reference and not as an absolute.