Some police departments already classify body parts as 'personal weapons'. I recall a case in california a few years ago where a pre-teen was mistakenly arrested over an alleged-but-not-remotely-plausible resemblance to a burglary suspect.

I can't remember the exact location or details sufficiently well to look it up but I remember the bit about personal weapons as an odd fact that jumped out at me from a copy of the arrest report.