Frankly, the facts as presented are pretty contradictory:
Police arrest the person who has no visible injuries? That should mean that they determined from something that he was the primary aggressor. If wrong, that coiuld be challenged in coiurt.
Most TPOs are "one way" -- they bar the Respondent from making any contact. Whether he feels like "caving in" or not, the answer is -- don't.
He should contact all social media companies, reclaim his accounts, and simply bar/ban/exclude his ex.
California may have separate rules and regulations (this questions went to a Nevada list); if your son has questions, he should consult with California counsel.
Answered on May 17th, 2017 at 6:58 PM