What really gets me about this case is that there was no need to knock on the door before getting a warrant in the first place. They were looking for a person, not evidence. They knew he had to be in one of two apartments. He’s not going anywhere at that point without being seen. Why could they not take the time to get a warrant for each apartment to search for the suspect? Once they had the warrant, they could knock on the door and they would have the warrants to flash if the owners didn’t cooperate.
Is there any rule that says they have to bust down the door if they have a warrant, even if the homeowner cooperates?