"REAL ID Act and RFID: Privacy and Legal Implications," a talk at The Last HOPE, tested one such wallet, and determined that while it's closed, it works--but the one they tried sprung open about an inch when placed on a table, and the rfid card inside was still readable that way.

http://www.thelasthope.org/talks.html http://www.thelasthope.org/media/audio/16kbps/REAL_ID_Act_an...