The banned Godolphin trainer Mahmood Al Zarooni was not being truthful when he said he didn't know he was breaking rules on banned substances, according to the British Horseracing Authority.
The BHA has published its reasons for banning Al Zarooni for eight years over doping offences.
Eleven horses he trained tested positive for anabolic steriods and he admitted to doping another four.
Godolphin is one of the world's leading racing operations, led by the ruler of Dubai, Sheikh Mohammed bin Rashid Al Maktoum.
