[Jon Stratis]

It always pays to be able to demonstrate there is no possible way your robot could have broken rule X (whatever the rule happens to be that year). For example, since we aren't allowed to extend more than 90 inches vertical, design hard stops or mechanical limits to your height that can easily be proven to an inspector, judge, or ref. Since the ball can't go under more than 3 inches, design hard stops to prevent that, and be prepared to demonstrate.

That's not to say that exceptional circumstances won't happen (like bouncing over a bump and landing a ball)... but you want to make it as clear as possible that you aren't violating that rule during normal game play.