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In American criminal law, "taking the Fifth", also known as "pleading the Fifth", is the act of refusing to testify under oath in a court of law or any other tribunal (such as a Congressional committee) on the ground that the answers that would be given could be used as evidence against the witness to convict him or her of a criminal offense.

Although similar to the right to remain silent when being questioned by law enforcement officers, and coming from the same source, namely the Fifth Amendment in the Bill of Rights, the right to refuse to answer when under oath has a longer history than Miranda rights.
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You have to get a lawyer. Who you gunna choose?

Johnnie Cochran