Last season I knew of two guys who were ice fishing with more holes then allowed. They said when they seen what they though might be a CO coming closer, they quickly cliped their lines and pulled their tipups. Once the CO finally got there, he asked the typical questions, then went on about the numerous holes drilled. They denied using more then 4 holes, then the CO pulled out a magnet on a string and dropped it down one of the unused holes, sure enough he pulled up their lure with a live minnow. Issued them both a fine right there.
EDIT: I know what your thinking, and NO, it wasnt me! lol