How long will evidence of drug use remain in a person’s system, and what variables affect results?
Duration times vary according to an individual’s metabolism, physical condition, frequency of usage, and hydration. However, for the average person, the following durations are considered reasonable. The “rule of thumb” for most drugs available on the street is 2-3 days. Marijuana can be detected for 8-12 days in a moderate user (3 times per week) and 21-30 days in a daily user. Testing for usage of alcohol and/or tobacco should be done as soon as possible. Testing should usually take place on Saturday or Sunday mornings.
