Like it seems with most UIL rules, it is squishy. There's a rule, but if they violate it, just report it...and not a darned thing will happen. Just like very long half times, knees not covered, wrong color jerseys, jerseys not covering back plates, not much is done to correct. Smile, officiate, have fun, and go on. Send a report if you think it will help, but at least to cover your rear.