The sad thing is yes the penalties should be harsher but if you run second to the drug cheats and you back your horse there is no reprieve, with proof could itbe that you launch a civil case against the guilty.
It is like the TAB and betting agencies committing fraud....think about it. in essence the bet has been accepted at the time everything is declared, down the track a positive and everyone wins bar the owner who backed his horse to win.:p