Hi Jim,

I have only seen the UV markings show up once at a casino cage. It was at JP McGills in Cripple Creek Colorado, shortly after they opened, and it was only at the "employees only" window. The black light fixture wasn't noticeable (overhead with the regular lighting,) but the chips had a "glow" that I hadn't seen before. This was almost four years ago, so the technology was probably in the early stages for live use as a valid cage security feature.

Bob