Only the driver may handle the reins/lines, whip, and brake during competition. Penalty for non-compliance is elimination for that class.
No change of driver is permitted unless otherwise specified.
Drivers receiving outside assistance after the judging has started will be disqualified unless that assistance has specifically been allowed (example: groom or passenger heading an animal in a line up).
Outside assistance which requires ELIMINATION includes, but is not limited to:
The use of communication devices of any kind between the driver and anyone else.
The use of electrical devices of any kind intended to give the driver an advantage.
Directing the driver in any way during a dressage test or on an obstacle course.