I just got back at 8:00am this morning from a power ball ticket run to Louisiana. I stopped by the Grand Coushatta in Kinder, LA. In the High stackes area of their table games they have switched to electronic chips and tables that read them. I only got the $25, but the have $25, $100, and $500 chips with the electronic circuit in them. I know Vegas probably already has them, but this is the first I have seen in LA. Thought you would like to see it.
You can't tell by feeling so it must be buried in the chip.