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Any witness may testify in a criminal trial, the competency would be determined by the cross examination. You would have to further define what you mean by "competent?"

Added: If the witness has previously been declared mentally incompetent by the court or by psychiatric exam, it is doubtful that the opposing attorney would even allow the individual to give testimony without challenging their status to the court.

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Q: Can any person who is mentally competent testify in a criminal trial?
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