These signs are now all over the casino. However, Rule 64 may not have existed last year, but NRS 465.075 has been law since 1985 and breaking it is a felony.
So why was nothing done last year at the main event final table by the casino, and why has no action been taken against the offenders since? There is plenty of evidence.
If someone was stood by a blackjack table crunching numbers, the casino wouldn't stand for it!