Security researcher Chris Paget recently drove around downtown San Francisco to clone RFID base Passports and Drivers Licenses using an inexpensive kit of wireless tools. More at theregister.co.uk:
Using inexpensive off-the-shelf components, an information security expert has built a mobile platform that can clone large numbers of the unique electronic identifiers used in US passport cards and next generation drivers licenses.
The $250 proof-of-concept device - which researcher Chris Paget built in his spare time - operates out of his vehicle and contains everything needed to sniff and then clone RFID, or radio frequency identification, tags. During a recent 20-minute drive in downtown San Francisco, it successfully copied the RFID tags of two passport cards without the knowledge of their owners.
http://www.theregister.co.uk/2009/02/02/low_cost_rfid_cloner/