I was first introduced to the article entitled Observations on the Habilitation of Children with Cortical Visual Impairment as a subscriber to the Journal of Visual Impairment & Blindness (JVIB).
Best Answer: Marijuana remains in your system for about 14 to 30 days. However, hair follicle tests typically detect THC (marijuana) for up to 3 months after you have quit using. Since THC (marijuana) stores itself in your fat cells, exercise -- especially fat-burning exercise like weight training and intense cardio -- can help get it out of your body faster.
Consider the following example: the half life of the THC in your system is 5 days. After smoking pot, your THC level in urine is about 100 ng/ml, but 5 days later it will be about 50 ng/ml. You will pass a urine test for sure the next day. Every case is different, though, and too many factors influence THC half life, so we can only approximate how long marijuana stays in the human body.