[edit]Only advice that i am seeking here is how to challange this result,just for the peace of my mind.I no longer have interest in FBI,Just want to know my legal rights and reinforce the fact that i didn't lie.[/edit]

Sorry to hear about your experience, I had a similar one with the NSA.  People have to find out the hard way that the polygraph, and preemployment polygraphs in particular, is a load of crap.  Did you admit to anything that may have "raised an eyebrow"?  Unfortunately, the more honest and open a applicant is, the more likely they are to fail.

You can forget about a retest as very few ever pass a retest at the FBI,

You can do two things.  Write a letter protest the results and requesting it be included in your file.  At a later date, you can then make a FOIA request for a copy of your file (takes forever).  George is good for advise in this area.

TC