So, I was reading some police reports on one of my cases last week, and was fascinated with some of the detail the detective provided regarding his observations of various suspects as he interviewed them. As he was questioning one suspect, he observed that he appeared nervous and was breathing rapidly. On top of that, he saw that his carotid artery was beating strongly and rapidly and estimated his pulse at over 100 beats per minute. With another suspect, he observed several signs of deception such as prefacing answers to questions with "honestly" and "to tell you the truth." Another suspect had a noticeable tremor in his right hand as he answered questions. Has anyone ever seen comments like this in a police report before? It was a first for me. I was especially interested in his close observation of one man's carotid artery and his estimate of his pulse. It's a wonder he could keep track of what the man was saying in between focusing on his artery and taking his pulse visually. Is it just me or does it seem like this detective has been to some class recently on human lie detection?