I have no idea what type of drug test they use. However, if you are trying to think of a way to thwart the test - forget it. The test can be a witch doctor dice throwing, it doesn't matter. Current caselaw allows for a presumptive result to be entered into evidence.
When you are on probation you are at the mercy of your probation officer. Don't give your PO any reason to violate you. It is not a pleasant experience.