RFID for tracking patients

I am thinking in making a system to track patients using RFID technology. So what kind of circuits I need?
Thanks for your help.

I was only talking about this with a work mate the otherday.

Check this out:

http://mifare.net/products/readerics/

http://www.supplyinsight.com/RFID_in...t_Tracking.htm

http://www.rfid.org/

http://www.theregister.co.uk/2003/06...hips_are_here/

http://www.google.co.uk/search?q=rfid


Regards
Ian