I am saddened to read of your experience. Like you, I also had never heard of polygraph countermeasures until a polygrapher accused me of using them.

Although I am not optimistic about your chances of being granted a "re-test" (granting of such would be an implicit admission on the Bureau's part that it lacks confidence in its ability to detect countermeasures), it is important that you contest your polygrapher's accusation in writing. Your polygrapher's accusation is now part of your permanent FBI HQ file, and it may adversely impact your future career prospects with any U.S. Government agency that requires a security clearance. The letter you send will be added to your file and will at least document the fact that you dispute the accusation. I don't think it would hurt to cc your letter to your Applicant Coordinator as a courtesy.

I hope you will consider joining us in working to put an end to polygraph screening. You'll find some suggestions on how to do that on the Get Involved page.