Are you worried that you may test positive on a drug screen? Well, in short, you should be if you have recently consumed pot. There are many ways to tell if you have THC in your system which is the main identifying marker for which you would be tested. In some cases, you could test positive for up to 30 days after smoking or eating pot but this has many variables and determining an exact time frame is impossible to do. Tetrahyrdacanibinal THC stores itself in body fat so depending on size and weight this could affect the outcome of your test. This is considering the type of screening you are getting or might get. The normal way to find out is by doctors running a blood or urine test, but there are even more ways and most people do not know this or fully understand what this means.
In some situations hair and fingernails can be tested for THC is these are the worst two if you are required to take one. Signals of pot use can appear to the right hair test for up to a year or more and the fingernail cuticle test could reveal even longer then that. If you have a court ordered drug screen and they specify a one of the two above you should really worry but at lest you can avoid one of them. If you have to get your hair tested for THC the best thing to do is the day before just cut it short if you are a girl or a guy just shave it right down to little stubs pretty much just enough for them to get a small piece.