Anecdotally I was snubbed at a younger age when the school district was looking for a security system to prevent manipulating school grades. My suggestion was to remove the disk pack (ok so it was a while ago) that contained student records while the students had access to the system via dialup, and replace it at night when the various accounting programs ran (attendance, grades, etc). Imagine my surprise when the contest ended with no winning solution, but oh by the way we've changed our policy and will not make the student grades data available during the day.

We did get them finally fess up that it was my suggestion which they had adopted and they gave me the prize (which was a $250 scholarship as I recall). But it has never ceased to amaze me that people don't think of security as holistically as they should.