I've seen many episodes of COPS where the guy is arrested on the woman's word alone, even if she doesn't have a mark on her. The woman doesn't get arrested unless the guy has visible injuries. Even in those cases, she has to be screaming and belligerent, and she gets a ton more benefit of the doubt than the guy does.
"I've seen many episodes of COPS where the guy is arrested on the woman's word alone, even if she doesn't have a mark on her."
That might be because its the law.