On one of my first visits to the DMV in San Francisco, I saw an employee ask around for the test key (this was about 10+ years ago, so they had a physical sheet of paper that was the key of correct answers) and hand it over to a test taker. I just assumed that it was some form of an internal testing thing, until I ended up behind her in the line to get photographed, when I realized that she was actually an applicant.