RFID technology identifies and tracks every chip for authenticity, tracking history, and to ensure there is no forgery, cheating, or stealing. Additionally, each casino carries uniquely branded chips, including color combinations, marked edges, and UV markings that are impossible to recreate.
It's definitely not easy to make counterfeits of casino chips. Nevertheless, criminals can produce the counterfeits on a massive scale once they figure out that they've created reasonable facsimiles.