Kasey Hayes lies on the ground after falling from his ride on Shaft during the Professional Bull Riding Tour stop at the Denny Sanford Premier Center on March, 13, 2015 in Sioux Falls, S.D.  Serious injuries are occupational hazards for bull riders, but doctors, riders and researchers say the most pervasive injuries are concussions. The Professional Bull Riders' circuit provides a stable of doctors, requires helmets for anyone born after 1994 and insists concussed riders pass a test before getting back in the saddle.  (AP Photo/Dave Eggen)

SIOUX FALLS, S.D. (AP) — Kasey Hayes hopped on the bovine beast trapped in the narrow holding pen like he’d done hundreds of times. He adjusted a tight rope on his left hand, found his balance and signaled he was ready to dominate the bull for the next eight seconds — or, at least, hoped to.

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