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In 1966, the Supreme Court decided on the case of Miranda v. Arizona, which established what are now known as Miranda Rights: "You have the right to remain silent. Anything you say can, and will, be used against you in a court of law. You have the right to an attorney. If you cannot afford one, one will be appointed to you."
The mandatory use of those words upon arrest stemmed from a case where a man, Ernesto Miranda, confessed to a crime not knowing he didn't have to talk. After being convicted, the Supreme Court overturned his case and declared every person arrested must be read those rights.
Although Miranda was later retried and convicted for the crime, he forever influenced police procedure in America.