Actually, the US is way ahead of them on this one. How can you beat citizens banging on your door and asking for an implant?

http://en.wikipedia.org/wiki/Microchip_implant_(hu man)
http://www.wnd.com/news/article.asp?ARTICLE_ID=487 60
http://www.wired.com/news/privacy/0,1848,50187,00. html

I agree it can't be long until governments and employers everywhere encourage people to "voluntarily" get chipped.