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The "Fourth Degree": The Lie Detector, Jack Streeter, Melvin M. Belli

Vanderbilt Law Review

Some police departments substitute for evidence the "third degree." It is illegal. Law courts could now supplement oral evidence with a "fourth degree"--the lie detector. It should be legal, when properly operated, when its results are properly introduced and weighed.

Any symposium on evidence ought to include some observations on cross-examination. A 'consideration of the instruments employable in the art of cross-examination should, of course, include a discussion of the instrument, the accepted use of which, some lawyers, and certainly the average layman, believe would make cross-examination unnecessary as to credibility.

The best legally available "lie detector" presently is a …