I was on a 75mic patch last year, every 48 hrs, and
the pain doc informed me that Fentanyl
would not show up on the typical drug screen. I was lucky enough to have never been randomly selected and I am subject to random drug tests. According to him Fentanyl can be found but the test is quite expensive so most screening stations just dont do it.
If the drug screen you are going to take is job related I would not chance it.