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Erm.. I'm afraid I didn't make myself clear. The policeman's statement is only going to be read out because none of the facts are in dispute, and to cross examine him would be pointless (this is in the competition rules).
I do have to ask the witness about what the policeman said, because it is about that witness. There is an inconsistency between the witness' and the policeman's statement, and the policeman's statement is true. (Again, competition rules dictate this). Therefore, I need to ask the witness about the inconsistency.