How long can marijuana be detected in your system after the last time you used it?

Marijuana can be detected in your system for a month or longer primarily due to its active component, THC, which is stored in body fat and can take a significant amount of time to be completely metabolized and eliminated. The detection window for marijuana use varies depending on several factors, including the frequency of use, the metabolic rate of the individual, the potency of the marijuana, and the type of drug test administered.

For infrequent users, THC may be detectable for up to a week, but for regular or heavy users, it is common for metabolites to remain in the body for a month or even longer. This is especially true for urine tests, which are the most common form of drug testing. Hair follicle tests can detect THC for even longer periods, sometimes up to several months, but in the context of urine testing and general discussion, the month or longer timeframe is the most relevant and accurate for regular users.