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For your test to fail would take a combination of unlikely things: their choosing to do a test that ordinarily would not be done, plus a supplier providing you different and more expensive drugs than you paid for, such as nandrolone for testosterone or Winstrol for Dianabol. Such a combination seems extremely unlikely. Even then, while a test that went directly to GC/MS might fail, I'd expect it to pass initial screening. So it would take a really unlikely combination of results to give a problem. Not necessarily impossible, but really unlikely.