What are the exceptions to the warrant requirement?
A. There are now nearly twenty. As Justice Scalia noted in California v. Acevedo, 500 U.S. 565 (1991): “Even before today’s decision, the “warrant requirement” had become so riddled with exceptions that it was basically unrecognizable. In 1985, one commentator cataloged nearly 20 such exceptions, including “searches incident to arrest . . . automobile searches . . . border searches . . . administrative searches of regulated businesses . . . exigent circumstances . . . search[es] incident to nonarrest when there is probable cause to arrest . . . boat boarding for document checks . . . welfare searches . . . inventory searches . . . airport searches . . . [and] school search[es]. . . .” Bradley, Two Models of the Fourth Amendment, 83 Mich.L.Rev. 1468, 1473-1474 (1985) (footnotes omitted). Since then, we have added at least two more. California v. Carney, [500 U.S. 565, 583] 471 U.S. 386 (1985) (searches of mobile homes); [and] O’Connor v. Ortega, 480 U.S. 709 (1987) (searches of offices
