It's amazing how many of us share the same experiences.  I am 28 yrs old, served proudly as a Marine and also failed my polygraph exam with Boder Patrol.  I honestly could not sleep for a week maybe a month thinking of how much of a failure I was.  I remember going into the polygraph exam office, greeting the agent who administered the exam, he was so friendly at first but after my first test, he started to get angry, calling me a liar.  The question i failed and till this day i don't know why is if i ever used or abused any type of illegal drugs? I honestly answered NO but somehow I was lying.  It was so hard for me to accept failing for something I did not do.  Before my BPA experience i was the type of person who believed in doing the right thing even when you thought noone was watching you.  Kept a good clean driving record, avoided any type of trouble, and was always making my self competitive and a good candidate for any law enforcement branch.  Got myself some good experiences while in the marines and i was ready and motivated to further my career and commitment to this country.  Like most of you i passed everything with no problem at all but the polygraph.  Made everything i worked for useless.