The problem is....you can't arrest or detain someone until they do something illegal.
Is self mutilation illegal? If not illegal, isn’t it a sign that someone is a threat to others and/or themselves. I believe once someone is a threat to themselves or others it is a legal reason to lock them up for 72 hours, even, in idiotic cauliflowernia it is. 5150 is the code number.
If the people’s government would enforce the law, lots of people would have a 72 hour pass to get the right meds and certainly be on the radar.