This would almost be comical, if it weren't so sad.   

Any person that would require their spouse to take a polygraph exam has some serious "trust issues" to work out, and is in serious need of counceling.......so is the spouse that would consider using countermeasures and lying during the process.   

Let me ask you this Manic, if your husband is requiring you to submit to a polygraph, do you honestly think that he'll believe the results of the exam, even if they come out in your favor?  Maybe your husband doesn't trust people in general, or maybe something happened in your relationship to trigger his mistrust, and now he doesn't believe your word.  At any rate, I don't think that a stupid machine that measures blood pressure, breathing, and sweat is going to alleviate any of his anxiety over the real issue at hand........your honesty.   

Good luck.  You're going to need it.   

Kona