Criminal Law Questions? Ask a Criminal Lawyer.
Have any of the other charges been dropped?
Ok. The first thing you need to do is get your son a criminal law attorney and work on having these other charges dismissed as this appears to be a mistaken identity issue.
Also, your son can sue the law enforcement agency for malicious prosecution, abuse of process, unlawful detainer, false imprisonment and assault for his mistreatment and the false accusations made against him.
But, the first thing is to get these charges addressed.