Kentucky Derby - 1968

The 1968 race was won by Dancer's Image (pictured above) but he was disqualified to last place after traces of phenylbutazone were discovered in the mandatory post-race urinalysis.  Phenylbutazone is a drug that was commonly give to relieve inflammation in the horse's joints.  It is legal at many tracks but not at Churchill Downs.  A post race appeal was filed and the race awarded to 2nd place finisher Forward Pass.

here is a video from the author of the recent book : 

Dancer's Image: The Forgotten Story of the 1968 Kentucky Derby 

Here is a montage of Kentucky Derby Winners from 1968 (Dancer's Image) to 1986 (Ferdinand)