A Tremor in the Blood: Uses and Abuses of the Lie Detector

By David T. Lykken | Go to book overview

Chapter 9
THREE DIFFERENT
VERSIONS OF THE CQT

There is no worse lie than the truth misunderstood.

-- WILLIAM JAMES

Man is the only animal that blushes -- or needs to.

-- MARK TWAIN


The Directed Lie Test (DLT)

The Directed Lie Test is a form of the CQT in which the subject is instructed to answer each control question deceptively. 1 "You've told a lie sometime in the past, haven't you? Well, I'm going to ask you about that on the test and I want you to answer 'No.' Then you and I will both know that answer was a lie and the tracings on the polygraph will show me how you react when you're lying." The DLT is scored in the same way as a standard CQT. Advocates believe that the DLT is an improvement because there is greater certainty that the subject's answers to control questions are false. Moreover, the DLT can be more nearly standardized than the CQT because the same control questions can be used in every case since the subject does not have to be duped into giving what he suspects may be a false answer.

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