Derailing a subject’s pre-rehearsed lie
If you’re dealing with a suspect who you think may be giving you a false account of something that happened — presenting you with a pre-rehearsed story — consider using an easy, effective technique for getting that story thrown off course (and his plan to snow you derailed). Pay close attention to the supposedly truthful details he’s giving you, then the middle of his “presentation” stop him and toss in an odd, completely-unexpected series of questions.
“OK, hold on a second. Are you right or left handed? Have you always been right handed? How about your mother? Is she right or left handed? Have you ever written with your off hand?”