The President of Jacksonville State University may appoint or employ one or more suitable persons to act as police officers to keep off intruders and prevent trespass upon and damage to the property and grounds of the university. Such persons shall be charged with all the duties and invested with all the powers of police officers. The officer may eject trespassers from the university buildings and grounds. The officer, without a warrant, may arrest any persons who commit disorderly conduct or trespass on the property of the university, or in any circumstance in which an arrest by a police officer without a warrant is authorized by law, and carry them before the nearest district court or municipal court charged with the trial of such offense. Upon proper affidavit charging the offense, the person arrested may be tried by the court and convicted as in cases of persons brought before the court on a warrant. The officer may summon a posse comitatus.