Miranda v. Arizona, 384 U.S. 436 (1966), was a landmark decision of the U.S. Supreme Court in which the Court ruled that the Fifth Amendment to the U.S. Constitution restricts prosecutors from using a person's statements made in response to interrogation in police custody as evidence at their trial unless they can show that the person was informed of the right to consult with an attorney before and during questioning, and of the right against self-incrimination before police questioning, and that the defendant not only understood these rights, but voluntarily waived them.

Miranda was viewed by many as a radical change in American criminal law, since the Fifth Amendment was traditionally understood only to protect Americans against formal types of compulsion to confess, such as threats of contempt of court. It has had a significant impact on law enforcement in the United States, by making what became known as the Miranda warning part of routine police procedure to ensure that suspects were informed of their rights. The concept of "Miranda warnings" quickly caught on across American law enforcement agencies, who came to call the practice "Mirandizing".

Pursuant to the U.S. Supreme Court decision Berghuis v. Thompkins (2010), criminal suspects who are aware of their right to silence and to an attorney but choose not to "unambiguously" invoke them, may find any subsequent voluntary statements treated as an implied waiver of their rights, and used as or as part of evidence. At least one scholar has argued that Thompkins effectively gutted Miranda.



The Supreme Court of the United States (SCOTUS) is the highest court in the federal judiciary of the United States. It has ultimate and largely discretionary appellate jurisdiction over all federal and state court cases that involve a point of federal law, and original jurisdiction over a narrow range of cases, specifically "all Cases affecting Ambassadors, other public Ministers and Consuls, and those in which a State shall be Party." The Court holds the power of judicial review, the ability to invalidate a statute for violating a provision of the Constitution. It is also able to strike down presidential directives for violating either the Constitution or statutory law. However, it may act only within the context of a case in an area of law over which it has jurisdiction. The Court may decide cases having political overtones but has ruled that it does not have power to decide non-justiciable political questions.

Established by Article Three of the United States Constitution, the composition and procedures of the Supreme Court were initially established by the 1st Congress through the Judiciary Act of 1789. As later set by the Judiciary Act of 1869, the Court consists of the chief justice of the United States and eight associate justices. Each justice has lifetime tenure, meaning they remain on the Court until they die, retire, resign, or are removed from office. When a vacancy occurs, the president, with the advice and consent of the Senate, appoints a new justice. Each justice has a single vote in deciding the cases argued before the Court. When in majority, the chief justice decides who writes the opinion of the court; otherwise, the most senior justice in the majority assigns the task of writing the opinion.

The Court meets in the Supreme Court Building in Washington, D.C. Its law enforcement arm is the Supreme Court Police.