Here's some examples of successful psychics who helped solve police cases: http://www.express.co.uk/life-style/life/603402/Psychic-detectives-solve-police-cases

These psychics, from the article, were able to get information from the victims themselves about how they were killed, which led to the killers being arrested. Maybe we could contact those same psychics to do a reading on Madeleine McCann or Johnny Gosch?