In 1999, a woodcutter named James B. Grinder confessed to a 15-year-old murder, the death of a 25-year-old woman named Julie Helton. A short time later, he recanted, contradicting himself over and over. His blood had been taken and compared against the crime scene samples — but with such an old crime, local police were worried the case might fall apart, so the sheriff called in a doctor he had seen on the news. The doctor's name was Lawrence Farwell, and he was promoting a next-generation tool called brain fingerprinting. It was an advanced lie detector that claimed to look into a suspect's brain to see if they were familiar with the details of the crime. This was the first time the technique had been used in an active criminal case,...
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