Allow surgeons to add and remove foreign objects from people

[Dr Zoidcrab]

Also note, it should probably be impossible to do alone, or it's obviously useless.
You don't want your victim to just empty their guts 20 seconds later, and you don't want people just randomly shoving power items deep within themselves in an instant.

If you don't want them to remove it when you're not looking you could use a spy sticker on them or stick a camera helmet on them. And yeah there would have to be a whitelist for things you can do it with.