California, United States of America
The following excerpt is from People v. Bravo, F067658 (Cal. App. 2015):
All of the observations made by the officers prior to the detention did not implicate the Fourth Amendment because observing what is exposed to public view is not a search; there is no expectation of privacy while in public. Fourth Amendment protection is not extended to public areas and areas open to public view, such as driveways. (People v. Lieng (2010) 190 Cal.App.4th 1213, 1224-1225.)
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