as far as i know, horses that have been away for a certain period of time in parx, need to have an accredited gate work in order to run. there might be other tracks that have the same policy.
every track needs a gate card before any horse runs in its first race.
also if the starter has a problem with the way the horse acts he might request the trainer of that horse to break the horse out of the gate before they allow him to run again.
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