What is the current state of the law on warrantless inspections of commercial premises?

The greater latitude to conduct warrantless inspections of commercial property reflects the fact that the expectation of privacy that the owner of commercial property enjoys in such property differs significantly from the sanctity accorded an individual's home, and that this privacy interest may, in certain circumstances, be adequately protected by regulatory schemes authorizing warrantless inspections.

Id. at 599 (citing United States v. Biswell, 406 U.S. 311, 316 (1972)).