On Friday, 2 January 2015, National Public Radio's All Things Considered" program included a report by Martin Kaste on the upcoming trial of Doug Williams for teaching people how to pass polygraph "tests." It's worth a listen; there is also an active comments section on the NPR website:
http://www.npr.org/2015/01/02/371925732/trial-of-polygraph-critic-renews-debate-over-tests-accuracy