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In page Post-consumer waste:

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In many countries, such as the United States, there is no reasonable expectation of privacy in post-consumer waste once it leaves the consumer's home. Anyone can search it, including the police, and any incriminating evidence recovered can be used at trial. This doctrine was established in The California v. Greenwood case, in which the U.S. Supreme Court held that there is no common law expectation of privacy for discarded materials. This has since led people to argue the legality of taking post-consumer waste for salvage value.[citation needed]