§ 208 Breaking door or window to arrest person escaping.

If someone is trying to escape arrest, or if another person is trying to help them get away, the police can chase them into a house to catch them. Before breaking in, though, the officer has to first announce who they are and why they're there, and ask to be let inside.

If the people inside refuse to open the door, the officer is then allowed to break open a door or window to get in, whether it's the front door or a door inside the house. This rule exists so that someone can't avoid arrest just by running into a home and locking the door behind them.