And that's exactly the reason the officer stopped the person identified in the complaint. He wanted to see if the person would testify against himself or if, in the process of running the person's identification, any corroborating evidence might show up.Becuase you changed the situation from the one I proposed: So what do you think the chances are of Person B being found guilty on no evidence other than Person A's testimony? You just added evidence above and beyond Person A's testimony.