On this score the police were especially wary, for Scotland Yard was still smarting from the infamous example of Adolph Beck, a Norwegian engineer who over the preceding decade and a half had been erroneously imprisoned for fraud, not once but twice, on the basis of eyewitness testimony, while the look-alike who actually had done the crimes remained free. The most important lesson of this “lamentable business,” wrote Sir Melville Macnaghten, “was unquestionably the extreme unreliability of personal identification.”
