Ixamyakxim: It's almost as if we've stumbled upon an ancient oath question, whereby if you answered truthfully, but in a way to disqualify yourself, you were somehow less qualified by said oath than if you had lied, to violate the very oath you had just sworn to, but by lying you were now approved.
grimwerk: A friend of my dad's once wanted to be a cop. One of the questions on the application was, "Have you ever smoked marijuana?" He figured that many people had, and being as he was starting a career as a policeman, he should be honest. He'd tried it years previously, so he checked "yes". Immediate rejection.
The question was certainly nominally valid, given the anti-drug madness of the time, but I wonder if there was a "you should be savvy enough to know when to lie" aspect to it.
The police force probably don't care if candidates lie on that question, just so long as they have a piece of paper to cover themselves if some fancy lawyer somehow manages to show the candidate/policeman did smoke it during a drugs case.