Changes include doubling the amount of testing done in-training and become effective Jan. 1.
The move of major bookmakers to offshore locations helped contribute to decreased wagering yield as British racing contracted 1.2% compared with four years ago, according to a recent British Horseracing Authority report.
The 15 Godolphin horses that tested positive for anabolic steroids, which led to Mahmood Al Zarooni's disciplinary hearing, will be prohibited from racing for six months.
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