8 GCA § 20.15: Peace Officer Arresting Without Warrant; Circum- stances.

(a) A peace officer may make an arrest in obedience to a warrant, or may, without a warrant, arrest a person:

(1) Whenever the officer has reasonable cause to believe that the person to be arrested has committed an offense in the officer's presence;

(2) When the person arrested has committed a felony, although not in the officer's presence;

(3) Whenever the officer has reasonable cause to believe that the person to be arrested has committed a felony or misdemeanor whether or not a felony or misdemeanor has in fact been committed.

(4) Who has escaped from any jail or prison or the lawful custody of a peace officer.

(b) There shall be no civil liability on the part of, and no cause of action shall arise against, a peace officer for false arrest or false imprisonment for an arrest which is lawful under Subsection (a).