To have compulsory process for obtaining witnesses in his favor
The Compulsory Process Clause gives any criminal defendant the right to call witnesses in his favor. If any such witness refuses to testify, that witness may be compelled to do so by the court at the request of the defendant or by being threatened with legal action.
However, in some cases the court may refuse to permit a defense witness to testify. For example, if a defense lawyer fails to notify the prosecution of the identity of a witness to gain a tactical advantage, that witness may be precluded from testifying.
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