Although newspapers reported that a murder victim had been stabbed with a knife, two police investigators knew that the actual murder weapon was a letter opener. While carefully monitoring the changes in heart rate and perspiration level of a prime suspect, the investigators asked him if he typically used a letter opener on his mail. The investigators were making use of the

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The investigators are using a technique known as the guilty knowledge test, which involves asking a suspect questions that only someone who was involved in the crime would know the answer to. In this case, the investigators knew that the murder weapon was a letter opener, so they asked the suspect if he typically used a letter opener on his mail. If the suspect shows signs of guilt or nervousness in response to the question, it may suggest that he is actually the killer. This is a common technique used in criminal investigations to help gather evidence against suspects.

Although Newspapers Reported That a Murder Victim Had Been Stabbed