THC can remain in your system for a month, but that doesn't mean you'll fail a urine test. THC is stored in fat cells and released as those cells are consumed for energy; thus, the faster your metabolism, the faster the THC will leave your body (through your urine).

Luckily, urine tests cannot tell how much THC is in your body or how much THC you consumed; all they can tell is how much is in the urine sample. Thus, there are two ways to help pass a test. One is to clear out as much of the THC as possible. Since it's been a month for you, most of it should have already cleared out, assuming your metabolism isn't extraordinarily slow. The other is to dilute your urine by drinking lots of water.

Urine testing occurs in two phases. The first is a cheap, fairly inaccurate test of THC concentration. If this test reports a concentration above a certain cut-off, a more expensive, more precise test is then done. If the first test comes back below that cut-off, the other test is never done to save money. While the more expensive tests are rather accurate and can probably only be passed by having little to no THC in your system, the first test can be passed merely by drinking enough water to dilute your urine.


I'm getting a bit long-winded and I'm not sure exactly where I'm going with all this, so I'll cut to the chase. It's been a month, so you should be fine. If you want to be extra cautious, start drinking plenty of water from now until the test. On the day of the test, make sure that you urinate at least once beforehand. Drink plenty of water after urinating and before the test so your urine will be somewhat diluted. When you're actually preparing the urine sample, try to capture the middle of your urination; the beginning and end will have a higher concentration of THC.

If they're not using a standard urine test, of course, that changes things.