well, they will, if the test is run for steoids. Just ask Floyd Landis.
But most emplyers just check for rec drugs, not steroids. I passed a piss test for my Coast Guard captains license on cycle and that was a "NIDA 5 point" test.
My testosterone therepy rep told me that therepy levels of test wont show up.One the other hand, if you are taking non-therepy dosages,it will show up as elevated levels.