I asked in a comment to an answer to the question Security clearance jobs: will security make it hard to get work done? whether real life agencies are as enamoured of the polygraph as their portrayal in modern TV drama series' such as Homeland?
There were a couple of responses suggesting that the use of polygraphs were quite routine, in the US at least.
Given the dubious validity of the polygraph as a lie detection mechanism, I had always assumed that Hollywood played up the role of the polygraph, but now I'm not so sure.
While I was working in the UK defence industry, I certainly never had to take a polygraph, and my only exposure since was a business angel who asked me to set up a website to distribute phone based lie detection software, which I was very dubious about.
So, how routine is the use of lie detector technology in security cleared workplaces, and indeed has anyone seen its use outside of the defence sector?