Text: In the warren of grungy rooms beneath the dance floor--the celebrities' sanctum sanctorum--the coke was consumed by the linear foot, and (according to the author) the odd European contessa could be found handcuffed to a water pipe, getting squired from the rear by one of the pretty shirtless busboys.
Entailment: Hard drugs were being used below the dance floor.
Contradiction: The parties that would happen below the dance floor were always free of alcohol and drugs.