If you have evidence that indicates infidelity recently, why do you need a polygraph to confirm it? If he won't admit to the infidelity in spite of the evidence, leave him.
The accuracy of the polygraph is questionable at best even when the examiner has formulated a series of related questions and asked them several times. What you describe is total quackery, and should not be given any weight in making a decision on your husband's infidelity.

I recently had my husband take a poly in regaurds to infidelity. He passed!
We have two children.....and some how I just needed something before going through with a divorce.
My husband traveled 50% of the year for years. He is an alcoholic and lied to me repeatedly!!! He admits to flirting on the internet and veiwing porn.
I had went to see my husband on one of his bussiness trips. When we were getting ready for bed, (our children) pulled back the covers......................to my disbelief..........there was seamin and blood all over the blanket!!!!!!! A bed that he had been sleeping on for 4 nights already.
Also....after a trip over seas ......I found very noticeable LONG BLACK hair in my husbands hair brush.
My huband admitted to going in to a club in Russia The "NIGHT FLIGHT". This is a club that caters to traveling bussiness men looking for sex. Matter of fact you can get off your flight in Moscow and you will see women holding a sighn that reads......."Do It Tonight at The Night Flight". They do serve food and hubby claims he only ate dinner.
My husband also would exchange pictures with women he met on the internet.
My husband has been very emotionaly abusive and phisicaly a coulpe of times.
I am not an insecure person, I felt I had good reason to feel he was being unfaithful. 
I had a relative that was involved in criminal activity and passed a polygragh...........later convicted with solid proof!!!
Baisicly I am more confused than I was before my husband took the Polygragh!
I am positive he did his research on how to pass a poly and refused that  I go with him. I had to fax my questions to the polygrapher and had a breif consultation over the phone.
Any insight on passing when you truely are lying? ???

Thanks for the reply Mr.Truth. I have to laugh when I read my own posting It sure does sound like the polygraphy was a quak!!!! My very close friends keep telling me that...........("BUT HE WAS BUSTED!!") I also believe one that might have a "Narcissistic Personality" Like I feel my husband does,......could have a better chance at passing even prior to learning how!

I have read so much on failing when truely not deceptive..........but not much on passing when truely deceptive........although my husbands behavior looks bad and things that I have came across would indicate infidelity..... (or) maybe just bad luck on his part??? "But"........ Is it that easy to pass if you are lieing??? Does CM'S help either way sense polygraph's are  not really lie detectors?................I would not rely on the polygrapher to get confession, or interrigate my husband to confess................husband is a "very" sraight faced lier!!!!         
The polygraph was taken at a investigator's agentcy.
Are these agencies equiped with the same type of machines that FBI use or police inforcement??
After reading my post wouldn't any one believe he was indeed guilty of infidelity...........and that is'n even the half of it!