Found this site that has followed general news on RFID for the last decade. The link is to a search for casino related articles. Most of little value. But, it does indicate that RFID chips are more prevalent than I had thought with 2,000 casino in 20 countries five years ago.
http://www.rfidnews.org/2010/04/06/b...chips-with-gpi
The image below is from a Popular Mechanics story on casino security at: http://www.popularmechanics.com/tech...curity/4341499