Can you tell me how I could pass a drug test for weed?

I don't know about. other doctors on this site, but I don't help people falsify medical tests of ANY kind. The way to pass a drug test is to NOT use those drugs. So stop, and depending on how heavy your use was for how long (and how heavy YOU are), your THC levels will come down over several weeks. The testing industry has gotten wise to ways to "beat" the test and they test for those ways. Talk to a counselor& quit.