Comment by giles_corey

Indeed, the FBI participated in the criminal investigation of the late Doug Williams, who offered training on how to pass or beat a polygraph "test." Because there was no actual crime for which to prosecute him, federal agents set out to stage one in a "sting" operation they dubbed "Operation Lie Busters":

https://antipolygraph.org/blog/2016/04/26/operation-lie-bust...