Interesting. A couple of questions/observations: some people just get nervous when questioned. Ask them if they ate the last donut and they start stammering and raising eyebrows and everything. They just don't like to be accused. Secondly, I have often wondered if people have researched whether people get better the more they tell bold lies. Like most other things in life there is apparently a talent to telling a good lie. There used to be website where people posted admissions and a student put up that he/she had used the same accident report several times to get out of exams by changing the date.
You make some good points. Many people do get nervous and defensive when questioned even about things they didn't do and can exhibit some of these traits. Do chronic liars ever get so good at it they can hide the traits that are dead give-aways? I believe they can. If a person lies often enough they soon begin to believe their own lies.