Stuart noted the risk of taking a PRIVATE polygraph is zero. (polygraphs given by the police, however, ARE NOT confidential and can be used against the client) The entire polygraph record is considered attorney/client work product and is always absolutely confidential when the polygrapher is hired as a defense expert. Furthermore, professional polygraphers and their staff remain obligated to keep all client interviews completely secret.
Finally, if the results of a polygraph are positive, then the price for the exam (usually around $500.00) is a small one. We now possess a report widely utilized by grand juries demonstrating the truthfulness of the client. If the polygraph results are negative, the exam remains confidential . . . as if the exam never took place.
So don't be afraid of a private polygraph administered by your lawyer's hired expert. It just might save your skin, too.