Ive been interested in some of the expose programs of criminals who were "caught in a lie". What comes out is that when questioned liars (who are guilty of a serious offence) will have rehersed their "story" so its often filled with elaborate detail. Think of Ian Huntley, the Soham girls murderer. He not only told elaborate lies to the police and the media but deliberately put himself out there, being "helpful" and thus drawing attention to himself.
Truth tellers usually deliver a much more basic version of their activities. They have no need to work up a story because they know they are telling the truth. And they expect to be believed. When quizzed on the details truth tellers often have to think carefully. Whereas liars will be able to easily reel off exactly what they had for dinner that night, what TV programs they watched, and so on.
A really clever criminal who wanted to conceal their activities would neither hide from investigation or deliberately put themselves in the spotlight. They would behave like others in the community. And when asked to give an account of their movements on that night produce a much more general account with some hesitation.
Its also possible that some liars, in the process of making up and rehersing their stories, will actually have come to believe in their own fantasy. Especially if they are recalling events from long ago or their childhood. What actually happened becomes mixed up with how they felt at the time.
Do people still stamp their feet in anger?
Waiting for memory clinic referral


I just do not have it in me and consider it pointless. I am not nasty though (like one of those 'say it like it is' people)