California, United States of America
The following excerpt is from People v. Murphy, 123 P.3d 155, 36 Cal.Rptr.3d 125, 37 Cal.4th 490 (Cal. 2005):
As a general rule, before entering a house to make an arrest or perform a search, officers must first identify themselves, explain their purpose, and demand admittance. (People v. Rosales (1968) 68 Cal.2d 299, 302, 66 Cal.Rptr. 1, 437 P.2d 489 (Rosales) [failure to state purpose invalidated
[37 Cal.4th 496]
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