In the Bleachers by Ben Zaehringer for April 19, 2012

Yep. There is a rhythm that shows up any change. Plus, there is no significant advantage – heel & toe is 75-80% the speed of the same distance running and a break in h&t shows up so obviously, and is instant disqualification, why cheat. Even in a pack, the officials can triangulate on the offender quite easily.