What are the mixed questions and fact in a motion to suppress evidence obtained from a warrantless search?

Mixed questions of law and fact in a motion to suppress evidence obtained from a warrantless search are reviewed de novo. United States v. Johnson, 820 F.2d 1065, 1072 (9th Cir.1987).

A screening search of the person or property of an airline passenger prior to boarding the aircraft "does not exceed constitutional limitations provided that the screening process is no more extensive nor intensive than necessary, in the light of current technology, to detect the presence of weapons or explosives, that it is confined in good faith to that purpose, and that potential passengers may avoid the search by electing not to fly." United States v. Davis, 482 F.2d 893, 913 (9th Cir.1973).