Depends on the type of test and the accuracy of the test. if they do a hair test...good luck buddy. If it's a standard pee test (normal given the low cost) then a week of flushing can work, but give yourself 2. Also, you could go to a local paraphanalia shop and buy some system cleaner. It's a gallon of the most nasty tasting stuff in teh world but it works. if it's a hair test, you are basically screwed, as your hair grows, it picks up chemicals from your bloodstream, if you do drugs, it will pick up in your hair. They take 2 or 3 hairs and can tell any drug that you have done for the length of time that hair has grown. Don't think you can sneak away and shave your head and get past it because they will take it from an armpit or pubes if they have to because they need a hair. Don't be alarmed if they ask for a hair test and you don't get the job by shaving your head. They will just say you were noncompliant to company request. I know all this because i work in a hospital and see it all the time. My best advice is just to not do the drugs. A 1 hour high and a month of paranoia and possibly not getting a good job...the consequence is not worth the trip.