I just recently took an ATF polygraph (2 in fact).  I was told that they do not use the terms "pass", "fail" or "inconclusive".  They could (or would) not, however, tell me what they do use.  The little info I could get out of them was that those terms are used for criminal polygraphs only.  For employment pre-screening it is a matter of significant responses only...  I am going to post this on a new thread as well.

As for the NCIS thing, when did you hear this?  I am currently in the application process and was tods Special Agent applicants MAY be polygraphed in the future but for now only Agents and others involved in Foreign Counterintelligence are polygraphed...