New Zealand Law
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He needs to get a lawyer to defend him, and then brief the witnesses who can give evidence on his behalf in court. It is possible that once the police realise he has a defence they may pull back on the charges but otherwise he will need to prepare for a trial and see who the judge believes.
The police sometimes just choose who they believe. So in this case they appear to support her story. If he has a legal aid lawyer sometimes they are junior and not as experienced, though that isn't always the case. But they will be acting for your son, and if he directs his lawyer to call your witnesses the lawyer will need to do so and talk to you. If he gets his own lawyer he can choose a criminal law specialist and will get closer attention of course. If you need a referral please advise your city and the court