My guess is that when the police get a tip like this they suspect that the so-called psychic is actually someone involved in the crime (perhaps caught up in a sense of guilt) or has knowledge of it by other than psychic means, and simply is using the “i know this because i’m psychic” routine as a way of trying to protect themselves should their identity become known. Therefore i can see how they would feel compelled to check it out,
Good point. Thanks.