"reasonable expectation of privacy"

In recent years, the Court has had occasion to rule104 that a search occurs when the government violates a person’s "reasonable expectation of privacy," a doctrine first enunciated in Katz v. United States.105 Katz signalled a paradigm shift, as the inquiry into the application of the constitutional guarantee was now expanded beyond "the presence or absence of a physical intrusion into any given enclosure" and deemed to "[protect] people, not places."106 Under this expanded paradigm, the "reasonable expectation of privacy" can be established if the person claiming it can show that (1) by his conduct, he exhibited an expectation of privacy and (2) his expectation is one that society recognizes as reasonable. In People v. Johnson,107 which cited Katz, the seizure and admissibility of the dangerous drugs found during a routine airport inspection were upheld by the Court, which explained that "[p]ersons may lose the protection of the search and seizure clause by exposure of their persons or property to the public in a manner reflecting a lack of subjective expectation of privacy, which expectation society is prepared to recognize as reasonable."108