235.—Every person who, contrary to the rules for military prisons and detention barracks, brings or attempts by any means whatever to introduce into any military prison or detention barrack any spirituous or fermented liquor or drug or tobacco and every person employed on the staff of any such prison or barrack who suffers any spirituous or fermented liquor or drug or tobacco to be sold or used therein contrary to such rules shall be guilty of an offence under this section and shall be liable on summary conviction thereof to a fine not exceeding F372[500] pounds or, at the discretion of the court, to imprisonment for any term not exceeding six months or to both such fine and imprisonment.