Answer:
reduced; were not
Explanation:
According to a study conducted by Honts, Raskin, and Kircher (1994), the use of countermeasures reduced the detection of guilty suspects by 50%, and the examiners were not able to tell that the suspects were manipulating their own arousal patterns. This was a findings from their research titled "Mental and Physical Countermeasures Reduce the Accuracy of Polygraph Tests".