Thanks for clearing up my question guys

Also, I'll have to agree with don somewhat. I agree that Sol was very paranoid and suspicious. Someone with that mind frame would most certainly frisk again. And ok I agree Sol's men searched the toilets/ lost the tail/ did two frisks prior

But who's to say michael didn't remove a big pipe in the bathroom and was about to splatter their brains over dinner. Not that it would have made much difference

As to what happened to Lou, unless the book stated otherwise, perhaps a mistake was made?

Doubt Lou would have went on a walk whilst a big meet was going on