Under Wilson v. Arkansas (1995) 514 U.S. 927, 931-934, police must knock and announce their presence before entering a home. However, such a requirement is obviously subject to exceptions based on emergencies. Likewise, it not going to apply to a garage attached to a home. Would it apply to a separate residence on the same property as the main home? Click on the following link to read a summary of an appellate court decision that addressed this issue.