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The Supreme Court has explained that what "a person knowingly exposes to the public, even in his own home or office, is not a subject of Fourth Amendment protection ... " But what he seeks to preserve as private, even in an area accessible to the public, may be constitutionally protected (see Katz v. United States, 389 U.S. 347 [1967]).
And also.
A business owner's expectation of privacy in commercial property is less than the privacy interest afforded to a private homeowner and is particularly attenuated in commercial property used in "closely regulated" industries (i.e., airports, railroads, restaurants, and liquor establishments), where business premises may be subject to regular administrative searches by state or federal agencies for the purpose of determining compliance with health, safety, or security regulations.
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