I am in Vegas at the moment, and thought this might be of interest:
All of the Harrah's properties have this prominently posted in all their sportsbooks (Harrahs, Caesars, Flamingo, Bills, Paris, Ballys)
Harrah's Entertainment Properties cannot take wagers on Boston Celtic's games because a Harrah's Entertainment Executive has an ownership interest in the Boston Celtics. We apologize for any inconvenience.