The following excerpt is from U.S. v. Winsor, 846 F.2d 1569 (9th Cir. 1988):
In Warden v. Hayden, 387 U.S. 294 [87 S.Ct. 1642, 18 L.Ed.2d 782] (1967), we recognized the right of police, who had probable cause to believe an armed robber had entered a house a few minutes before, to make a warrantless entry to arrest the robber and to search for weapons.
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