..... as Dr Richard Nicholson said, this could also introduce caring by numbers, and that sounds distinctly creepy to me. My Great Grandmother battled dementia for many years before succumbing at the grand old age of 94, but she received excellent personal care and that was a massive boost to her fight. Tags could remove much of the contact such sufferers receive and in spite of the positive side of the idea it needs a proper look to avoid possible pitfalls.