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Churchill Downs is instituting tougher drug testing just weeks before the Kentucky Derby, requiring pre-race blood tests used to detect stamina-enhancing "milkshake" concoctions.

Every horse entered in races during Churchill Downs' spring meet (April 30-July 10) will be tested. Failure to comply will result in the horse being scratched.

A "milkshake" is made of baking soda, sugar and electrolytes, and is believed to increase the concentration of carbon dioxide in a horse's bloodstream and lessen lactic acid buildup.

Owner Rick Porter decided not to run Rockport Harbor in any Triple Crown races after a poor showing in the Lexington Stakes on Saturday.