He had a great technique - he carried an indelible ink pen with him - the only weapon he needed. When he would run into someone staying they would start in on him saying things like, "it's a free country - you can't force me to leave". He would smile and explain he was cool with that, but that he would appreciate it if they would use his pen and put their social security number on their arm. That stopped them - - they would ask why - and he would tell them it would make it easier to identify the bodies... save him a lot of time.
Try it - tell your Mom that it would be a favor to the first responders...
Great idea! I was thinking about a toe tag. I like your idea better.