How to quickly rid the body of marijuana ?

You can't: I know of no way to clear marijuana/thc from your body more quickly. If you are not a heavy smoker you will likely pass most tests after not ingesting marijuana for about a week, but it depends on how sensitive the test is. Here is a wide-ranging discussion on this topic (not by docs) that is interesting: http://forum.Grasscity.Com/apprentice-tokers/1047449-how-beat-urine-drug-test.Html.

Stop using it: Your body has to process what you put in it, and it has metabolic pathways to do this. However, these have their own timeline and you cannot rush them. Best way to make sure there's no marijuana in your body is not to use it, period. Depending on frequency of use, your urine could be positive for thc for days to weeks after last use. It's stored in fat, and stays in hair up to 90 days too.