Maine Revised Statutes Title 17-A. Maine Criminal Code § 1058. Unauthorized possession of firearm in courthouse

A. A law enforcement officer, a corrections officer or a corrections supervisor engaged in the performance of the law enforcement officer's, corrections officer's or corrections supervisor's public duty;

B. A person possessing an unloaded firearm for the purpose of offering the firearm as evidence in a civil or criminal proceeding if the presiding judge or justice has granted prior approval in writing to the person and the person possesses a copy of the written approval; or

C. An employee of a courier or security service in the course and scope of employment for the courier or security service, as approved by the judicial marshal.