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 form of the guilty knowledge test, where they ask a question that only the perpetrator (or someone with knowledge of the crime) would know the answer to. In this case, the investigators know that the murder weapon was a letter opener, so they're using that information to ask the suspect if he typically uses a letter opener on his mail. The suspect's reaction to the question can help the investigators determine whether or not he has inside knowledge of the crime. The two-factor theory relates to the idea that emotions are made up of both a physiological and cognitive component, the Yerkes-Dodson law is about the relationship between arousal and performance, and the spillover effect refers to how emotions from one situation can affect emotions in another situation. None of these theories relate directly to the investigators' use of the guilty knowledge test in this scenario.

Although Newspapers Reported That a Murder Victim Had Been Stabbed