Seabiscuit: Why was John "Red" Pollard Suspended in 1937?

Question

Its for a school project need answers Fast!!

Answer 1

December 7: Following a near-collision with another horse and rider at Tanforan Race Track in California, Pollard is suspended from racing at Tanforan for the remainder of 1937. In the wake of the devastating suspension, War Admiral is named horse of the year by Turf and Sport Digest.

Answer 2

http://www.bv229.k12.ks.us/BVW_Culp/seabiscuit_timeline.htm
December 7: Following a near-collision with another horse and rider at Tanforan Race Track in California, Pollard is suspended from racing at Tanforan for the remainder of 1937. In the wake of the devastating suspension, War Admiral is named horse of the year by Turf and Sport Digest.

December 22: Pollard is suspended by the California Horse Racing Commission from riding on any California track until January 1, 1938. Furious at the harsh judgment, Howard pulls Seabiscuit out of races until Pollard's suspension is over.