I'll jump in here.

Depends on what you actually admitted to, if anything, on the FBI polycrap exam.  If you apply for a government job requiring a clearance,  there will probably be a BI.  I don't think mere squiggley marks on a chart will disqualify.  The people doing the BI might not even be state dept security types.  Might be contractors.  They might not think much of polygraphy either.

And remember, there is plenty of inter-agency rivalry over obtaining people with critical skills.

Screw the FBI, and horse they rode in on.  The NSA poly-mob reported me to the FBI after my polygraph and I got a call from them (the FBI) wanting to meet with me.  I refused to meet with them and nothing ever happened over it.

The only way I would say, No, don't waste your time, would be if you're talking about applying for a TS job requiring a polygraph interrogation.  In that case, you're still dealing with federal poly-cops.

Good Luck,

TC