How do you test negative for marijuana use?

Detection times depends on multiple factors : - weight, height, metabolism - when and how much you smoke - what kind of test you will take - urine, saliva or hair etc. If you want to clean yourself in a natural way with drinking more water, exercising a lot and eating high fiber diet, it is possible but you will need a lot of time, not less than a month or two. You can try with some detox,but hey also are not so sure and they do not clean your body, they just mask the drug for about an hour or less.

The one absolutely certain method is to not use it.