There is more chance of being found with a baggie in your purse while going through security at the pleb gates than there is walking into the changerooms next to the man of the moment.
He was probably a good hour away from even leaving the ground.
Footballers can be very very dumb but they're half-smart about drug use. No one, not the wife of a what, 250 gamer with a high-profile, is going to walk drugs into the rooms. Even when they're out at clubs they get their mate to carry it on them.