From BC website. I guess it is current policy for them as stated below. More at the link below than what I have cut and pasted here. But today things changed from what they have currently written obviously.

We were successful in implementing event-specific race conditions for 2012 and 2013 which prohibited race day administration of furosemide in Breeders' Cup two-year old races in cooperation with the CHRB, Santa Anita and the TOC. [size=large][b]However, in evaluating host-site options for 2014, it became apparent that the race-day medication policy for 2014 would have to be consistent with rules in effect in any eligible host jurisdiction at the time of the event. The horsemen's groups in potential host jurisdictions indicated that they would withhold their approval of simulcast rights unless this was the case, jeopardizing our ability to conduct simulcast wagering on our event, and thus the event itself.[/b][/size]

There has been good progress toward uniformity on model rules in the US over the last several months and the Breeders' Cup has endorsed that effort. [size=large][b]To date, no racing jurisdiction in the US has established a policy eliminating the use of all race-day medications and none of our potential future host sites has been able to offer assurances that such an eventuality is likely in the near term.[/b]
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http://www.breederscup.com/article/breeders-cup-statement-event-medication-policy