Jockey William Carson, 29, returned a positive test for metabolite of cocaine at Lingfield Park in April
William Carson, the grandson of the Derby-winning jockey Willie, faces a six-month ban from the saddle after becoming the fourth jockey this year to return a positive test for a metabolite of cocaine.
Carson, 29, has ridden nearly 500 winners in a 14-year racing career, with his most valuable success coming in the Ayr Gold Cup Handicap in 2008 on Regal Parade. He also took the Group Three Autumn Stakes at Newmarket on Best Solution in October 2016.