The National Trainers Federation has said it is "shocked" by the news of positive tests on horses trained by Godolphin's Mahmood Al Zarooni.
In a statement, the NTF chief executive Rupert Arnold said: "Like everyone else in the sport of horseracing, the NTF is shocked at the news of these positive tests at the stable of Mahmood Al Zarooni.
"News reports so far suggest this case is an aberration and is not indicative of wider use of anabolic steroids in British horseracing.
"Without wanting to diminish the seriousness of this case, in some ways it is a positive message that the presence of these substances was detected so the sport is kept clean."
More top news
Startled Mohammed Asif leapt from the first-floor of his home in Smethwick, Birmingham, as officers stormed his property.
Tens of thousands of people paid their respects at a full state funeral for Romania's King who was deposed by Communists in 1947.
Remaining cold for most this weekend with the risk of ice overnight