State v. Richards, 201 Wis. 2d 845, 549 N.W.2d 218 (1996)

In this case, the majority opinion held that police officers are never required to knock and announce their presence before entering a home to execute a search warrant in a felony drug investigation. Abrahamson filed a concurring opinion arguing that the 4th Amendment does not permit a blanket exception to the “knock and announce” requirement, but the facts of this case permitted a “no-knock” entry. The United States Supreme Court sided with Abrahamson and reversed the majority opinion. Richards v. Wisconsin, 520 U.S. 385 (1997).