About the 2 people shot at the White Sox game this past weekend.....

[Effete Snob]

12. It was in folds of fat and skin

The human body looks, to most of the EM spectrum, like a bag of salt water or similar weak conductor. There's a reason why the folks you see with metal detectors at a saltwater beach either (a) avoid wet sand and surf, or (b) have a metal detector specifically made for dealing with saltwater.

Unless they feel like shaking down every spectator who has an implanted medical device, then they probably are not using a metal detector that is going to flag pacemakers, dental fillings, or other internal metal objects.

While some people with medical implants will take appropriate paperwork to TSA checkpoints, it's generally not expected at sports stadiums.

Lots of people have metal in their bodies for lots of reasons.