(1) Every person who drives or uses or takes possession of a mechanically propelled vehicle without the consent of the owner of such vehicle or other lawful authority shall be guilty of an offence under this section and shall be liable on summary conviction thereof to a fine not exceeding fifty pounds or, at the discretion of the Court, to imprisonment for any term not exceeding six months or to both such fine and such imprisonment.
(2) Where a person is charged with having committed an offence under this section it shall be a good defence to such charge for such person to show that when he did the act alleged to constitute such offence he believed and had reasonable grounds for believing that he had lawful authority for doing such act.
(3) Any member of the Gárda Síochána may arrest without warrant any person whom he reasonably suspects to be engaged in committing an offence under this section.
(4) An indictment containing a count for larceny of a mechanically propelled vehicl