Former FBI agent reveals techniques to detect deception
JP Schneider stashed this in Humans
Look for a direct yes or no. Beware the person who uses well.
The land of 'is'
Yes-or-no questions deserve yes-or-no answers. When people cannot or do not want to answer yes or no, they typically go to the Land of Is. This concept was derived from President Clinton's now infamous statement, "It depends upon what the meaning of the word 'is' is. If 'is' means 'is,' and never has been, that's one thing. If it means there is none, that was a completely true statement."
The Land of Is occupies the space between truth and deception. The Land of Is consists of half-truths, innuendos, suppositions, assumptions, and verbal judo. Most people want to tell the truth, so they go to great lengths to contort the English language to maintain the illusion of truth without telling it entirely. People often find themselves in the Land of Is without ever being aware of it.
To test people for the truth, simply ask them a yes-or-no question. If they fail to answer yes or no, a red flag should pop up. After someone provides a convoluted answer to a direct question, ask the same question again. If he or she once again fails to answer with a yes or no, the probability of deception increases significantly.
If you ask someone a direct yes-or-no question, and the response you get begins with the word "Well," there is a high probability of deception. When a person answering a direct question begins with "Well," it indicates that he or she is about to give an answer that he or she knows the questioner is not expecting.
Why should I believe you?
When truthful people are asked why others should believe them, they typically answer, "because I'm telling the truth" or some variation thereof. Liars have a difficult time saying "because I'm telling the truth," because they are not telling the truth. Instead, liars offer various responses such as "I'm an honest person," "You don't have to believe me if you don't want to," or "I have no reason to lie." The question "Why should I believe you?" can be asked in a variety of ways depending on the sensitivity of the relationship.
These methods do not detect deception with 100% certainty, but they do provide a strong indicator to determine if someone is being truthful. If a person answers questions directly, you can have confidence that the answer is truthful and that the person will not be aware that you have tested their veracity, thus preserving the integrity of ongoing relationships.
If the person does not directly answer questions, it does not necessarily mean you are being deceived, but you should examine the person's answers in greater detail.