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How did Miranda v. Arizona affect police questioning of suspects?

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President Lyndon B. Johnson signs the Medicare Bill at a table beside former President Harry S. Truman, with Lady Bird Johnson and others standing behind them. — Legislation Former U.S. president Harry S. Truman (right) looking on as U.S. Pres. Lyndon B. Johnson signs the Medicare bill at the Harry S. Truman Library and Museum in Independence, Missouri, July 30, 1965.

The U.S. Supreme Court’s 1966 ruling in Miranda v. Arizona fundamentally transformed police interrogations by establishing mandatory procedural safeguards to protect a suspect's Fifth Amendment privilege against self-incrimination.12

Before questioning a suspect in custody, law enforcement officers must now provide the Miranda warning, which informs the individual of the following rights:12
* The right to remain silent.12
* That any statements made can be used as evidence against them.12
* The right to have an attorney present during questioning.12
* That an attorney will be appointed if the suspect cannot afford one.12

If a suspect invokes their right to remain silent or requests an attorney, police must cease interrogation. Statements obtained without these warnings are generally inadmissible in court. While these requirements were designed to prevent coerced or false confessions, the Court has subsequently clarified that suspects must "unambiguously" invoke these rights to be protected. Additionally, the failure to provide these warnings does not grant a suspect the right to sue the officer for a constitutional violation, as the warnings serve primarily as a trial-based safeguard.12