I thought this might be of interest to the readers:
http://caselaw.lp.findlaw.com
doing a search for 'polygraph' elicited many results:
http://caselaw.lp.findlaw.com/scripts/casesearch.pl?court=circs&CiRestriction=polygraph
I include the following passage from USA v CORDOBA:
"the district court made the following findings:
The reliability of polygraph testing fundamentally
depends on the reliability of the protocol followed
during the examination. After considering the evi-
dence and briefing, the court concludes the proposed
polygraph evidence is not admissible under Fed. R.
Evid. 702. Although capable of testing and subject to
peer review, no reliable error rate conclusions are
available for real-life polygraph testing. Addition-
ally, there is no general acceptance in the scientific
community for the courtroom fact-determinative use
proposed here. Finally, there are no reliable and
accepted standards controlling polygraphy. Without
such standards, there is no way to ensure proper pro-
tocol, or measure the reliability of a polygraph
examination. Without such standards, the proposed
polygraph evidence is inadmissible because it is not
based on reliable `scientific knowledge.'"