This is a well written article focusing on the two sides of the medication issue.
CHANGING THE FOCUS AND POWER IN RACING BY FRED A. POPE
The Horseplayers Association of North America says more than 74% of its horseplayers favor a ban on drugs. That research provides the path to revenue. For example, if the host event writes conditions without medication and that race competes against seven other races at the same time, the race without medication has a huge advantage. That race becomes a “brand name” in a generic market