ID implants (about the size of a grain of rice) are available right now and some folks have voluntarily had them installed. Usually they (currently) contain medical info, and I could see them for that, especially if you have some real problems.

Benetton, among others, is implanting the same sort of thing in their clothing. When sold it will register the place, date, price, etc. and thereby allow better cost and stockage control. The data "chip" is never removed from the garment and can resist washing, etc.

I don't want a chip installed in my body, and I CERTAINLY don't want my clothes telling the government where I am and what I'm doing! Suppose I lend my brother a pair a pants and he...well, he's my brother and not even he is sure what he's going to do next.