"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.
I was reading a story about a woman who was addicted to meth and got off of it. She was saying that 15 years ago, the cops busted in her boyfriend's house (she and another girlfriend were there, too) on a raid. The cops found several ounces of meth, scales, and packaging materials. Her boyfriend was arrested and drugs and paraphernalia were confiscated. What's interesting was that the boyfriend was arrested, the two women were left behind. They were briefly asked if they were involved in the drugs, of course they said "no", and that was it. After the cops left, the two women were just sitting there asking each other, "How the hell are we not in jail right now???"
That wouldn't happen today. Today, the women would be hitting the floor just as hard as the guys and they would be doing time just like them.