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At the time of cross-examination the witness will be caught.

Added: By virtue of the ciminal investigation which led to the arrest and charging of the defendant(s), the prosecutor pretty much already knows the facts of the case and can generally tell when a witness's statements stray off into deceptions or outright lies. When a prosecutor questions a witness he is NOT guessing at what the witness's answer might be, he already knows what it should be.

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Q: How does the prosecutor know a witness is lying?
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