What is the current state of the law on "unreasonable searches" under the Fourth Amendment?

"We now recognize the constitutional encasement which renders inviolable the individual's reasonable expectation of privacy; any governmental intrusion into that privacy is an 'unreasonable search' within the meaning of the Fourth Amendment, whether that intrusion be the traditional physical search [citation] or a surreptitious auditory invasion [citations] or indeed visual intrusion [citations]." (Lorenzana v. Superior Court, supra, 9 Cal.3d 626, 639, 108 Cal.Rptr. 585, 511 P.2d 33, italics added.)