It will depend on what kind of test your doing. Urin test will not show as long as a blood test will. is he doing an employment test or are they looking for AS use? regular preemployment screening does not usually test for steroids ect. it is to expensive. They just check for narcotics. since winny has such a short half life I would guess that it would be out of his system in a couple days but I'm just guesing.