By a 6–2 vote (
Justice Kennedy took no part in the case), the Court held that under the Fourth Amendment, no warrant was necessary to search the trash because Greenwood had no
reasonable expectation of privacy in it. Although Greenwood had hidden the trash from view by putting it in opaque plastic bags and expected it to be on the street only a short time before it would be taken to the dump, the Court believed it to be "common knowledge" that garbage at the side of the street is "readily accessible to
animals,
children,
scavengers,
snoops, and other members of the public." Moreover, Greenwood had left the trash there expressly so that the trash collector, a stranger, could take it. Quoting
Katz v. United States, the court concluded that "[w]hat a person knowingly exposes to the public, even in his own home or office, is not a subject of Fourth Amendment protection." Greenwood argued that the evidence should be excluded under the
California Constitution, which the California Supreme Court had interpreted to prohibit warrantless searches of garbage left at the curb (
People v. Krivda, 1971). However, the Constitution had been amended in 1982 by the passage of
Proposition 8, also known as the "Victims' Bill of Rights". One of its provisions, the Truth-in-Evidence Act, eliminated the
exclusionary rule for unconstitutionally obtained evidence. The Court rejected Greenwood's claim that the amendment violated the
Due Process Clause. It held that so long as the police conduct did not violate federal law, "California could permissibly conclude that the benefits of excluding relevant evidence of criminal activity do not outweigh the costs." ==Dissent==