Ordere of Protection Appeal Process

I'm keeping this brief, Son is or shall i say was a police officer ( Fired beause of OP )
he's is appeal the OP what is allowed in the appeal process. He is going thru divorce and wife said in 911 call no domestic violence,in OP request said no domestice violence, but on stand said he thru ring and hit her and he pulled her down the hall. No 911 called after this was made, no edivence of any bodley harm, This is what caused him to lose his job. So what can he produce in court to remove OP and get his job back.