For quite a while, we've been following the case of Douglas Gene Williams, accused of and indicted for teaching people to pass polygraph tests that they might otherwise have been unable to, and for the claims he made in advertising this training -- and specifically for showing his techniques to some undercover Federal agents. Now, reports Ars Technica, Williams has pleaded guilty to five charges of obstruction of justice and mail fraud. From the article: Williams isn't the first person prosecuted for these type of allegations. An Indiana man was accused of offering similar services and was sentenced in 2013 to eight months in prison. The judge presiding over the case said the case blended a "gray area" of First Amendment speech and the unlawful act of instructing people to lie on polygraph tests issued by the federal government. Williams' site, Polygraph.com, is now defunct.