Before testifying, a witness is required to declare that he or she will testify truthfully, by oath or affirmation. The courts have decided:

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The witness need not express a religious belief or belief in God. The U.S. Constitution guarantees the right to freedom of religion, and witnesses are not required to have a particular religious belief in order to testify truthfully. Therefore, a witness can choose to take an oath or affirmation without expressing a belief in God or any particular religion.

Before Testifying, a Witness Is Required to Declare That He