After receiving a job offer, before which I passed a background check, I had to take a polygraph. According to the examiner I showed some reaction to a question regarding sex with a minor as well as my past drug usage. He said that he wasn't concerned with the sex question but was about the drug question. He then gave me a "second chance" and I took another polygraph specificly about drug usage. Which I failed. As I explained to him during the background check, the pre-test quesioneer, and during his interrogation after I failed he test, I had smoked pot while I was in Iraq about 5 times and once after returnin home. The last time was about 3.5 years prior to the test. 

I then apealed the test results. This was a waste of time. I explained the circumstances of the test and my  use as well as some reasons for me exhibiting stress at that question (including the fact that it reminds me of Iraq and also a friend who was killed ovev there).  The did not grant me even a 2nd polygraph with a different examiner. They stated that since I failed the polygraph they could not risk hiring me due to the chances That the results were real. 

I was not lying about my drug usage and no I feel like no matter where I apply now they will see the fail and not ben consider me. Is there any way to force them to at least grant another test or to legally refute the practice of a pre-employment test. I was #3 on he corrections list and #1 on the Patrol list...now I don't see me ever getting into this career path. Z

This is the result of blind reliance on the polygraph.  The fact is, there are other starry eyed recruits lining up behind you, which when hooked up to the box, the squiggly line Gods favor them.

Sorry to hear about your experience, and good luck in the future.