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I used to work for a major eastern railroad and part of my job was routinely testing the cab signal system, plus I was also qualified to operate locomotives in the shop area for testing purposes. A side benefit of my job was that I was subject to random testing 4 times a year. I smoked pot when I was much younger so I never worried about the testing but always felt it a huge intrusion on my personal freedom, not to mention a bit insulting. Maybe that personal freedom doesn't really exist in the USA.
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