I wasn't aware of Mexican casinos other than during the Agua Caliente times ( my web page: http://www.antiquegamblingchips.com/AguaCalienteChips.htm ), but here is an interesting, strange article about the many of them now in Mexico where they are supposed to be illegal:

Corruption in Mexico casinos takes a toll in the U.S., too

http://www.kansascity.com/2011/11/22/3281232/corruption-in-mexico-casinos-takes.html

Robert