Search and Seizure In Public Places In California
People v. Hyde (1974) and Ingersoll v. Palmer (1987) are founded on a well-established line of federal and California authorities that recognize "administrative searches" as an exception to the general rules regarding searches and seizures in public places.
Administrative searches are in furtherance of an administrative purpose (such as air travel safety) rather than simply a criminal investigation seeking to secure evidence of a crime.
Administrative searches may unveil evidence of specific criminal behavior, but they also deter criminal behavior by making it harder for would-be criminals to position themselves so as to commit crimes. (People v. Hyde, supra, 12 Cal. 3d at pp. 165-166, and cases cited therein.)