Section 19

If any instruments or appliances for gaming are found in any place entered under this Act or upon any person found therein or if persons are seen or heard to escape therefrom on the approach or entry of a Magistrate or Justice of the Peace or senior police officer or if a police officer or any person having authority under this Act to enter or go to such place is unlawfully prevented from or obstructed or delayed in entering or approaching the same or any part thereof, it shall be presumed until the contrary is proved that the place is a common gaming house and that the same is so kept or used by the occupier thereof.