It follows a an investigation by the BHA.
The British Horseracing Authority has found jockey Robbie Dunne guilty of bullying and harassing a fellow rider Bryony Frost.
He was charged with four counts of conduct prejudicial to horseracing, with the majority of the incidents taking place last year.
A further three charges of violent and threatening behaviour are yet to be considered by the disciplinary panel.
Dunne could be banned for up to three years.
Panel chair, Brian Barker:
"We have real concern the weighing room culture is deep rooted and coercive and is not conducive to the good health and development of race riding"
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