A clairvoyant (i.e. psychic) person employed by police forces. For example, Patricia Gagliardo has been employed by various police forces for over 20 years. The efficacy of the practice is questionable; a common trick used by psychics is called retrofitting, to provide vague clues which are later reinterpreted to fit the facts. What this says about police detective skills is worrisome; since studies of the efficacy of such persons do not support the practice. Indeed, there are numerous examples of police investigations that were thrown completely off track by psychic advice.