There are judges on the course to monitor form. Three judges submitting "red cards" for violations results in disqualification. There is a scoreboard placed on the course so competitors can see their violation status. If the third violation is received, the chief judge removes the competitor from the course by showing a red paddle.
For monitoring reasons, races are held on a looped course or on a track so judges get to see competitors several times during a race. A judge could also "caution" a competitor that he or she is in danger of losing form by showing a paddle that indicates either losing contact or bent knees.
No judge may submit more than one card for each walker and the chief judge may not submit any cards; it is his or her job only to disqualify the offending walker. Disqualifications are routine at the elite level, such as the famous case of Jane Seville disqualified within sight of a gold medal in front of her home crowd in the2000 Summer Olympics.
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