Bracelets don’t work, they’re foreign objects - they don’t remember why they’re there so they just take them off. Shoes can work, but they might not put them on. QR tattoos - how do you know if an elderly person you see in the street is lost? Can’t approach everyone „hey you got a tattoo?“ - it’s a hard problem. Imagine your memory reset every few minutes to before the dementia started - that has to be your basic assumption for a solution. Maybe implantable trackers eventually, or prevent them from leaving through humanoid robotic avatars … working on that: www.devanthro.com