I took a polygraph for customs and border protection a few months back and I admitted to drug use even though I lied previously on my application. I told the agent the truth and at the end he told me I failed and wasn't being honest and the only way he would consider me for a retest is if I came clean and no matter how many times I told him I told the truth he said I didn't and said he wasn't gonna play games all day so I just left... Still no word from anyone not a letter email or phone call. My opinion is the "random selection" for polygraphs is just to get the less qualified applicants out of the way.