I got a scan and it showed a bunch of staples. I don't know what the staples are made of, but I have never set off a metal detector.
Lauren - you definitely have supporters who are also offended by the bullying on here. I don't practice pouch stretching, nor was I told to by my top surgeon, and I have no problems with urgency or anything.
OP - I think asking your doctor would give you the best information about your question.