By nature or training, law enforcement officers use a variety of cues to either predict the behavior of others, or to provide insight into their more obvious activities.
A suspect who suddenly tenses his muscles or who looks furtively toward a possible escape route telegraphs to the officer that he is about to fight or flee. Responding to questions with non-direct answers or more questions — “Where do I live? I just got into town last week” indicates outright deception or an attempt to conceal information.
