Several years ago I took a polygraph for a law enforcement position.  I was never officially told that I failed, but since I got the old post-test interregation and a form letter telling me my application was withdrawn (no reason given).  I wasn't terribly upset becasue I already had a great job that paid twice as much as the law enforcement job.  However, I did (and still do) want to serve my community, so I have applied to another agency.  With a new polygraph on the horizon I know that I will be asked about the old one.  Any advic on how I should answer questions regarding previous polygraphs?