unknown metal found by metal detector at airport?

i heard that about 10 years ago there was a story on the news or in the newspaper about a man who was walking through a metal detector at an airport, and they detected a piece of metal in his leg or his arm or something like that, and he claimed to have never broken anything there so why should there be metal there…well he had it x-rayed and there was a piece of metal there, he had it removed, they analyzed it, and it was made of an unknown material…does anybody else know about this story, where it happened or anything?

ive heard a similar story but it ended up being a doctor that left something in him after surgery

Metal Detecting – Two Hunts in City Parks