I don't have to do the metal detector thing for music, but, I do go to the county building a couple of times a year. There, you have to go through a walk-thru metal detector scanner thing, with sheriffs running the system.
Me: I have an implanted long lag bolt for a right heel, and a halo of screws that look like construction/drywall scews all around the foot/heel interface. Its never been an issue.