The history channel is airing a show on forensic science which includes polygraph, I wonder if they are aware of the lack of true science invovled.... from the history channel website comes this:

Forensic Firsts :
Today, crime investigation is a high-tech science. But how did forensic detection get its start? In a riveting 2-hour special, we trace the origins of four key investigative techniques: ballistics, trace (microscopic) evidence, the polygraph, and criminal profiling. Rarely told stories of murder, kidnapping, terrorism, and stalking reveal how these techniques were developed. Features interviews with top criminal investigators and true-crime authors.

airing times may vary but are available on the history channel website  Http://www.historychannel.com