Like the NSA, the FBI also participates in career fairs across the country. The FBI website includes a listing of upcoming events:
http://www.fbi.gov/employment/fairs.htm
These fairs would be an excellent place to put up AntiPolygraph.org posters (http://antipolygraph.org/posters.shtml) and to bring the polygraph issue to the forefront (in the presence of future FBI applicants) by challenging the recruiters over the FBI's use of such voodoo science to screen applicants!