Section 143G. In an action for false arrest or false imprisonment brought by any person, by reason of having been detained for questioning or awaiting the arrival of law enforcement, on or in the immediate vicinity of a motion picture theater, if such person was detained in a reasonable manner and for not more than a reasonable length of time by a person authorized to make arrests or by the owner or his agent or servant authorized for such purpose and if there were reasonable grounds to believe that the person so detained was committing or attempting to commit any violation of section 143F, it shall be a defense to such action.