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The Federal Procurement Data System provides on-line access to information about U.S. Government purchase orders. Registration is required, but is free.
A search for records of fiscal year 2004 contracts with the three major manufacturers of polygraph instruments (Axciton, Lafayette, and Stoelting) revealed the following purchases:
Total US Government Purchases from Polygraph Manufacturers in FY 2004: $351,667.30
Mattel markets a product called a Magic 8-Ball that has about the same validity as a lie detector as does the polygraph. But the Magic 8-Ball has the advantage that, unlike the polygraph, it is not susceptible to countermeasures. With a manufacturer's suggested retail price of $5.99, for the amount paid to polygraph manufacturers in FY 2004, the US Government could have obtained some 58,000 Magic 8-Balls at retail prices, roughly enough for every federal investigator to have his or her very own personal lie detector/truth verifier. No doubt, even more Magic 8-balls could have been obtained with a wholesale discount.