In United States v. Katz (1967) 389 U.S. 347, the Supreme Court held it violated the Fourth Amendment for the FBI to attach an electronic listening devise to the outside of a telephone booth. The court noted it is persons, not places, who are protected by the Fourth Amendment, electronic surveillance violates an individual's justifiable reliance on privacy, and the government must obtain a warrant to engage in electronic surveillance. ( Katz, supra, 389 U.S. at pp. 351, 353, 359.)