8 GCA § 20.50: Forced Entry to Make Arrest Allowed after Notice, and Refusal.

(a) To make an arrest, whether with or without a warrant, a peace officer may break open the door or window of any house in which the person to be arrested is, or in which the officer has reasonable cause for believing him to be, if, after giving notice of his authority and purpose, he is refused admittance.

(b) A peace officer who has witnessed the commission of an offense may pursue the offender into any ship, plane, building, or grounds.