In the same email blast with the GPS ankle bracelet interpretation was an interpretation for insulin pumps.
Legal by order of our state interscholastic sports governing body, no paperwork needed by the team nor the player.
I spotted one of these for the first time last year.
Wasn't sure what it was, maybe an antibiotic, drug, or chemotherapy delivery system?
Let it go with no questions asked, seemed to be medical device with no danger to any of the players.