BALTIMORE - In most years, the buzz surrounding the Preakness Stakes is about whether the Kentucky Derby winner can keep their triple crown hopes alive.But this year's race is nearly overshadowed by a doping scandal that threatens to disqualify Bob Baffert’s Medina Spirit before the race even begins.The Derby winner failed a post-race drug test after testing positive for 21 picograms of betamethasone.The Maryland Jockey Club and 1/ST Racing reached an agreement Tuesday with trainer Baffert that will permit Medina Spirit to run the second leg of the Triple Crown so long as Baffert subjects the horse to extra testing and monitoring.If Medina Spirit tests positive again, the horse will not be allowed to compete.RELATED: Kentucky Derby winner.