All statements, calls and reports law enforcement, and govt boards/agencies/offices as well as statements made during litigation and court proceedings and papers are immune and protected from civil lawsuits. Making false reports is a crime (and filing charges is only for crimes) but only the govt can prosecute crime, you and your son can not. There is no such thing as filing charges for defamation because defamation is a civil cause of action and filing charges is for crimes. As I explained above, your son can not sue any of these people for what they did or said in this context. Your son and his attorney can do their best to bring the falsity to the attention of the DA, and if the DA wants, it can prosecute them for perjury or making false reports, but you guys can not force them.
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Defamation is not a criminal charge, it is a tort in civil law. In other words, the victim can sue someone for it. You should also think about suing for malicious prosecution. It is difficult to predict your chances from your description, but the first step is beating the criminal charges, which your son has done. As for how long you have, the statute of limitation for defamation and malicious prosecution is one year.
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Your chances are pretty close to zero. There is a qualified immunity for discussions with police and a qualified immunity for statements made in court. You have to prove the alleged victim lied to the police or in court. Your son being found "not guilty" does not mean the alleged victim lied; instead, it means that the prosecutor did not prove the case "beyond a reasonable doubt." The fact that it got past a directed verdict means the judge felt there was sufficient evidence to let the jury decide.
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