CD just issued a release:

http://www.kentuckyderby.com/sites/kentuckyderby.com/files/u64720/20140425%20Churchill%20Downs%20Releases%20Derby,%20Oaks%20Equine%20Security%20Protocols,%20Re-Emphasizes%20Ongoing%20Safety%20and%20Inte.pdf

On the 2nd page under MEDICATION, the 1st bullet point states they are doing out of competition blood testing for all horses in the Derby and Oaks AND for at least 50% of the horses in the undercard gr stakes. They state the time frame is both before & after entry. To JB's point though, I don't imagine we have anyway of knowing how long before entries they did the tests, and since many (most?) of the horse's were not even on the grounds 2 weeks prior, think we can assume much closer to entry date is when they were tested.

The undercard stuff, though, that does appear to be new. Not 100% of them, but does anyone recall them testing undercard horses at all before under the enhanced regimen?