Answer:
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 prevents 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.[1] 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 Supreme Court decided Miranda with three other consolidated cases: Westover v. United States, Vignera v. New York, and California v. Stewart.
The Miranda warning (often shortened to "Miranda", or "Mirandizing" a suspect) is the name of the formal warning that is required to be given by law enforcement in the United States to criminal suspects in police custody (or in a custodial situation) before they are interrogated, in accordance with the Miranda ruling. The purpose of such is to ensure the accused are aware of, and reminded of, these rights before questioning or actions that are reasonably likely to elicit an incriminating response.
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.[2]