Brigham City, Utah v. Stuart

At 3 a.m., police responding to a noise complaint at a Brigham City home saw teens drinking outside and, looking through a window, saw an ongoing fight inside involving several people, at least one of whom was bleeding; an officer announced himself at the door without being heard, then entered and stopped the fight. Stuart and other partygoers (defendants), arrested on various charges, argued the warrantless entry violated the Fourth Amendment, and the trial court and Utah Court of Appeals agreed, suppressing the resulting evidence.