I had a great conversation with one of my cofounders about this. First off, if you're only asking questions to a point where they are gameable then your questions aren't very good. The example I was trying to explain to him was that I look for 'aggressive curiosity' and wasn't sure I wanted to put that into the job description. He laughed and asked how far could someone game that as we keep asking follow up questions on any aspect of the discussion?