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Richardson will miss Olympic 100

American champion Sha’Carri Richardson cannot run in the Olympic 100-meter race after testing positive for a chemical found in marijuana.

Richardson, who won the 100 at Olympic trials in 10.86 seconds on June 19, spoke of her ban Friday on the “Today” show. She tested positive at the Olympic trials and so her result is erased. Fourth-place finisher . . .

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Medina Spirit drug test confirmed; Derby win in jeopardy

LOUISVILLE, Ky. (AP) — Bob Baffert’s lawyer said Wednesday that a split-sample test of Kentucky Derby winner Medina Spirit came back positive for the presence of the steroid betamethasone, which could lead to the horse’s disqualification and discipline for the Hall of Fame trainer.

Attorney Craig Robertson said the second test showed 25 picograms of the steroid, after 21 picograms were found initially. Even a trace amount of betamethasone — a picogram is a trillionth of one gram — is prohibited on race day in Kentucky, Maryland and New York, which are home to the sport’s Triple Crown races, and considered a violation.

Robertson said additional testing is being conducted to try to trace the source of the drug to an ointment to treat a . . .

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