If a defendant refuses to answer a question, what is it called?

The right covers a number of issues centered on the right of the accused or the defendant to refuse to comment or provide an answer when questioned, either prior to or during legal proceedings in a court of law.

Explanation:

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It's the right to silence. They have a right to stay quiet.

Explanation:

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.