Final answer:
Signs of deceit during an interrogation may include avoidance of eye contact, fidgeting, and physiological responses like increased heart rate and sweating. Polygraph tests aim to measure these responses but their accuracy is controversial. Legal protocols must be followed during interrogations to ensure evidence is admissible.
Step-by-step explanation:
When attempting to determine what are signs of deceit during an interrogation, professionals often observe a range of physical and behavioral indicators. Familiarity with body language is crucial; for instance, refusal to maintain eye contact, fidgeting, distraction, and inappropriate facial expressions can be telltale signs. Conversely, strong emotional responses can provoke physiological arousal, detectable via increased heart rate, sweating, and respiration. This physiological response forms the basis of a polygraph test, which measures these signs of arousal in an attempt to discern truthfulness. However, the accuracy of polygraph tests is widely debated, as lying does not have a universal physiological signature. Lastly, in legal contexts, it’s important to consider the admissibility and reliability of evidence gained from interrogations, including the respect of a suspect’s rights, such as the notification of the right to counsel as protected by the Fifth Amendment.