...Profiling stories aren’t Whodunits; they’re Hedunits.
In the Hedunit, the profiler does not catch the criminal. That’s for local law enforcement. He takes the meeting. Often, he doesn’t write down his predictions. It’s up to the visiting police officers to take notes. He does not feel the need to involve himself in the subsequent investigation, or even, it turns out, to justify his predictions. Once, Douglas tells us, he drove down to the local police station and offered his services in the case of an elderly woman who had been savagely beaten and sexually assaulted. The detectives working the crime were regular cops, and Douglas was a bureau guy, so you can imagine him perched on the edge of a desk, the others pulling up chairs around him.
That's from the latest demolition job from Malcolm Gladwell. He sets up the article with what sounds like an amazing success story in profiling, where the hero provides police officers vital clues in amazing detail ("When you catch him ... he'll be wearing a double-breasted suit. ... And it will be buttoned.") that allow the latter to nail some nasty psychopaths. He slowly works his way up to a thorough debunking of the entire profiling enterprise (at least, the FBI's version of it). Here's some seriously delicious stuff:
... when [Laurence Alison, one of the leaders of the Liverpool group and the author of “The Forensic Psychologist’s Casebook,”] broke down the rooftop-killer analysis, sentence by sentence, he found that it was so full of unverifiable and contradictory and ambiguous language that it could support virtually any interpretation.
Astrologers and psychics have known these tricks for years. The magician Ian Rowland, in his classic “The Full Facts Book of Cold Reading,” itemizes them one by one, in what could easily serve as a manual for the beginner profiler. First is the Rainbow Ruse—the “statement which credits the client with both a personality trait and its opposite.” (“I would say that on the whole you can be rather a quiet, self effacing type, but when the circumstances are right, you can be quite the life and soul of the party if the mood strikes you.”) The Jacques Statement, named for the character in “As You Like It” who gives the Seven Ages of Man speech, tailors the prediction to the age of the subject. To someone in his late thirties or early forties, for example, the psychic says, “If you are honest about it, you often get to wondering what happened to all those dreams you had when you were younger.” There is the Barnum Statement, the assertion so general that anyone would agree, and the Fuzzy Fact, the seemingly factual statement couched in a way that “leaves plenty of scope to be developed into something more specific.” (“I can see a connection with Europe, possibly Britain, or it could be the warmer, Mediterranean part?”) And that’s only the start: there is the Greener Grass technique, the Diverted Question, the Russian Doll, Sugar Lumps, not to mention Forking and the Good Chance Guess—all of which, when put together in skillful combination, can convince even the most skeptical observer that he or she is in the presence of real insight.
Fabulous stuff. Go read all of it.