SilkyBlue, quit guessing at the answer. If you don't know the answer to a question in the drug testing forum, then don't post something. This isn't the place for guesses. People jobs, freedom, or even child custody may rest on a drug test and you posting guesses or bad information isn't going to help them at all. No commercial hot links either.

Killerweed is right. Blood tests have a short detection window and it is usually about 72 hours, sometimes a little more but not much. There is nothing you can really do for the blood test but it does have the short window of detection.

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Serenity now, Insanity later...

Get a home drug test if you want to know for sure if you can pass a drug test. Drinking lots of water for days and days before the test will not help you get clean quicker. All that water will not make your kidneys work better.