Although newspapers reported that a murder victim had been stabbed with a knife, two police investigators knew that the actual m

Question

4 years ago

5

Although newspapers reported that a murder victim had been stabbed with a knife, two police investigators knew that the actual m

urder weapon was a letter opener. While carefully monitoring the changes in the 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 ________.

Social Studies

1 answer:

Rashid [163] · Answer 1 · 2022-02-15T18:42:30+03:00

Answer:

The investigators were making use of the guilty knowledge test.

Explanation:

The guilty knowledge test, as the name suggests, uses the knowledge that only a perpetrator would know to test if that subject could be guilty of that crime. A polygraph examiner watches the subject's physiological arousal under the belief that certain details will provoke reactions. In this particular case, the real criminal would know that the crime was committed with a knife, not a letter opener. Therefore, if the subject being examined is the perpetrator, he will not react to "letter opener" as he will to "knife".