A waste of time and effort, there are just too many variables involved in pigeon races.
With humans, horses and dogs the controlled administration of drug taking is at hand right up to the last point, and unlike our birds, no distractions of nature will be taking place.
Plus, can anyone point me in the direction of one single piece of quality, in depth controlled research that has taken place as to which wonder drugs are the most effective with racing pigeons, the operative word being, 'Racing Pigeons'.