Newmarket-based trainer Mahmood Al Zarooni has officially been charged with rule breaches related to prohibited substances, duty to keep medication records, and conduct prejudicial to racing.
The 37-year-old will stand before a disciplinary panel of the British Horseracing Authority on Thursday afternoon after samples taken from 11 of his horses were found to have contained traces of anabolic steroids.
Al Zarooni is the trainer for Sheikh Mohammed's Godolphin stables. His Highness has condemned al Zarooni's actions, and will hold an internal inquiry into the affair.
Al Zarooni could lose his training licence for this, one of the most significant doping scandals in recent racing history.