One of the commonest questions asked.
The following guide covers urine drug testing only.
Dose size and route of administration are among the factors which determine the period after use during which the drugs or metabolites might be detected in a urine sample. As these are almost always “unknown” all drug detection periods are normally given as a window and will cover around 90% of cases.
Amphetamine 3-5 days
Barbiturates 1-5 days (longer for Phenobarbitone)
Benzodiazepines 2-30 days depending on half live of drug
Cannabis 3-30 days
Cocaine 3-5 days
Codeine 1-2 days
Dihydrocodeine 1-2 days
Methadone 3-7 days
Morphine 3-5 days
Propoxyphene 2-4 days
MDMA 2-4 days