Private investigators will find Psychology Today, the poor man's polygraph tests parts1-5 to be helpful when conducting interviews.

The Poor Man's Polygraph consists of a series of techniques that increase the probability of detecting deception using verbal cues. The Poor Man's Polygraph provides deceptive indicators, not proof of deception. No one verbal cue indicates deception, but the probability of deception increases when clusters of deceptive indicators are present. The Poor Man's Polygraph provides non-threatening, techniques to test the veracity of others using the cluster method.

The Poor Man's Polygraph consists of the following techniques: Well..., Land of Is, Forced Response, Why should I believe you?, and Parallel Lie. The Poor Man's Polygraph will be presented in a five part series. Part 1 presented the Well... technique. Part 2 presented the Land of Is. Part 3 presented Forced Response. Part 4 will present Why Should I Believe You? The Poor Man's Polygraph can be found in its entirety in Psychological Narrative Analysis: A Professional Guide to Detect Deception in Oral and Written Communications. Part 5 The Parallel Lie provides an additional indicator of veracity.


Links:
http://www.psychologytoday.com/blog/let-their-words-do-the-talking/201011/poor-mans-polygraph-part-1

http://www.psychologytoday.com/blog/let-their-words-do-the-talking/201011/poor-mans-polygraph-part-2

http://www.psychologytoday.com/blog/let-their-words-do-the-talking/201011/poor-mans-polygraph-part-3

http://www.psychologytoday.com/blog/let-their-words-do-the-talking/201012/poor-mans-polygraph-part-4

http://www.psychologytoday.com/blog/let-their-words-do-the-talking/201012/poor-mans-polygraph-part-5