http://www.bloodhorse.com/horse-racing/articles/68511/jockey-club-seeks-tougher-medication-rules
Have not read the entire PDF (linked within the article), but, included in the Executive Summary ...
Horses should be allowed to compete only when free from the influences of medication
Furosemide is currently prohibited although this may be effected through a transitional process
Only RMTC-accredited laboratories are permitted to test samples, with results available to the public