What is the test for obtaining a warrant to search a person's home?

The Fourth Amendment's warrant requirement protects one's privacy interest in home or property. Absent exigent circumstances or some other exception, the police must obtain a warrant before they enter the home to conduct a search or otherwise intrude on an individual's legitimate expectation of privacy. See Maryland v. Dyson, 527 U.S. 465, 466 (1999) (per curiam) ("The Fourth Amendment generally requires police to secure a warrant before conducting a search." (citing California v. Carney, 471 U.S. 386, 390-91 (1985))).