How long a drug will be detectable in a person’s system after drug use ceases is a complex issue. It depends on the individual, their lifestyle choices and the drug, or drugs, in question.
Factors related to the individual include metabolism, age, sex, exercise, fluid intake, diet and other drugs or medication taken.
Factors related to the drug itself include purity, dose, and frequency of use and route of administration.
Numerous websites provide data tables similar to the one below but there is quite a variation in the windows of detection from one site to the next. The time frames depicted are based on local statistics.
Although every care has been taken preparing the table, it should be used as a guide only.