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British Horseracing Authority ruled he bullied and harassed rider Bryony Frost.
Robbie Dunne has seven days to appeal the findings of the independent disciplinary panel of the British Horseracing Authority that ruled he bullied and harassed fellow rider Bryony Frost.
According to the Irish Examiner, Dunne, 36 , who denied all but one of the charges, was banned for 18 months, three of which were suspended.
He was found to have engaged in conduct at the track, online and in the weighing room that was prejudicial to the integrity, proper conduct and good reputation of racing.
In the publication of its written reasons for the ruling on Thursday, the three-person panel, which was chaired by Brian Baxter QC, said it concluded the case "overwhelmingly called for a penalty of some potency."