Normally, the absence of a post-test interrogation is a good indication that one has passed. However, this is not necessarily the case with regard to FBI "re-tests."
While the FBI has not published information regarding the pass rate on "re-tests," feedback received by AntiPolygraph.org from numerous applicants suggests that the results of "re-tests" are almost always the same as the initial "test." I suspect that the
FBI HQ polygraph unit correctly judges that it cannot afford to be seen reversing more than a few initial polygraph results, because to do so would call into question the reliability of their pseudoscientific technique.
As you may be aware, the FBI (specifically, the HQ polygraph unit) has
lied in writing about the accuracy of the polygraph to its employees (who are now subject to periodic counterintelligence-scope polygraph screening), falsely claiming that "[c]urrent research continues to show that the polygraph is highly reliable and a valid technique." If the FBI were to reverse more than a handful of pre-employment polygraph results, it would expose the foregoing claim for the blatant falsehood that it is.
It is worth noting that when AntiPolygraph.org first went on-line (September 2000), the FBI very rarely granted "re-tests" to applicants. Now they are frequently granted, if the applicant requests it. But it appears that the purpose of granting re-tests is more to create the illusion of fairness than the reality (and perhaps to put the FBI in a better legal position to defend itself against future lawsuits such as
those that are being litigated by Mark Zaid).
But let's keep our fingers crossed and hope for the best. Please let us know the result when you receive it.