Separate questions, separate answers.
Are there psychics who claim that they have helped to solve crimes, locate dead bodies or missing persons and so on? Yes, many.
Are there people who believe that these psychics have, in fact, materially helped in the solving of crimes, in ways that cannot be easily explained without the ‘psychic powers’ hypothesis? Yes, some people do believe this, including some police officers, some scientists, some researchers and some writers. You can read a book called ‘The Blue Sense’, by Marcello Truzzi among others, which documents the evidence supporting this view and makes a good case, although not a compelling one.
Are there some experienced and respectable police officers and detectives who believe that psychics can sometimes be useful in solving cases? Yes, but they are very, very few. It is not a view that is widely supported within the law enforcement community. However, when you think of how many people worldwide are involved professionally in some aspect of law enforcement, you can probably find six of them who believe anything.
Are the claims made by these psychics, or made on their behalf by fans and admirers, often exaggerated out of all proportion to the psychic’s actual role in any given case? Yes.
Do some people who sincerely believe they are psychic, and who believe they can help with a case, often offer their help (unbidden) to the police? Yes. It happens a lot. It is obviously the case that if enough supposed psychics make enough guesses and suggestions about a case over a period of time, then some of these guesses may eventually turn out to be correct or almost correct. I can always tell which card you’ve drawn from a shuffled deck, if I’m given 52 guesses. Or if 52 of us all make one different guess.
What is the official police line? It varies from place to place. In general, you will find very little enthusiasm for so-called psychics among experienced officers and detectives. However, there is a difference between actual police practice and PR. Law enforcement officers cannot be seen to be rejecting offers of help, and they cannot be seen to be openly dismissive of well-meaning meaning people who come forward and say ‘I have information that can help solve this horrible murder and catch the crook’. Whenever there is a major case, part of the police role is to gather and collate any and all information, even if it may initially seem to be irrelevant or unhelpful. So if a guy wanders in and says ‘I can help’, they listen and make a note. Even if they think he’s a raving nutcase.
Are these so-called psychic sometimes actually unhelpful? Yes, of course. Some police officers wll tell you that the time taken up dealing with so-called psychics is time wasted, and time that could have been better spent on actual productive police work.
Is there any good reason or good evidence in a scientific sense to support the hypothesis that people with psychic powers can sometimes help in the solving of crimes? No, not yet.
Is it a nice idea that might sometimes give hope and comfort to relatives and loved ones who happen to believe in this sort of thing? Yes.
Is it an exciting, headline-friendly idea that might give a journalist something to splash at the top of a story? Yes.
Do police authorities sometimes appoint someone in an official capacity to liaise with or deal with psychics? Yes, this has happened, although not often. But it is open to interpretation. The psychic says, ‘Look, they value my input so mch that they have appointed an official police liason officer to work with me’. Another source might say, ‘We have to have a way of containing and controlling these deluded but well-meaning people, and to stop them wandering into the office at random, making wild suggestions to the press or otherwise interfering. If we appoint what we say is an official liaison officer, we can keep them happy while containing the damage they might do’.
As is always the case when ‘psychic ability’ is discussed: psychic powers are as real as you want them to be. If you are selective enough with the evidence, you can make a plausible case for anything. Putting it another way: faith plus bias is an open equation - it can add up to anything you want.