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:

Question

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The guilty knowledge test is a technique used by investigators to determine if a suspect has knowledge of specific details that only the perpetrator would know. In this case, the investigators knew that the murder weapon was a letter opener and were trying to see if the suspect had that knowledge by asking if he typically used a letter opener on his mail. The changes in heart rate and perspiration level were used to gauge the suspect's response to the question and determine if he was being truthful or not.

Although Newspapers Reported That a Murder Victim Had Been Stabbed