However, Mr Villaraigosa said he took full responsibility for breaking official protocol about declaring the gifts, which included complimentary tickets to the Oscars and baseball games.
Substitution of robots at any time during a tournament is strictly forbidden. Any team or teams that knowingly substitute robots will be disqualified from the tournament.
Women have occasionally scuffled with police when barred from entering stadiums, although now and then they have been allowed into smaller venues to watch sports such as basketball or volleyball.
That led Dr Benedetti to wonder if the effect of legally administered pre-competition morphine might, perfectly legally, be carried over into a competition by giving a placebo.