Trainer Bob Baffert has been suspended for two years by Churchill Downs after a second positive drug test from Medina Spirit, the Kentucky Derby winner.
Perth Racing's managing director John Yovich has been sacked for alleged misconduct in the workplace.
Rombauer has won the 146th running of the Preakness Stakes at Baltimore's Pimlico Race Course, ending Kentucky Derby winner Medina Spirit's Triple Crown bid.
Top French jockey Pierre-Charles Boudot has been sidelined from riding following his indictment for rape.
Trainer Bob Baffert says Preakness favourite Medina Spirit's dermatitis ointment might have caused the Kentucky Derby winner to fail a drug test.