I agree with the point berleybag is trying to get across. But punishment in some form must be handed down to all concerned, in a consistent manner.
The industry has a limited capacity to work within in solving this problem whether you believe it or not. They have to be very conscious about the consequences that may implicate the industry as a whole from any punishment handed down.
If the number of drugs users are as high as the grape vine suggests, and then we oust them all, who then will ride trackwork? Who will take their horses to the races? Who will muck out, who will feed the horses? How will racing clubs get full cards? How will the industry turn over enough profit to be in a position to adequately handle such problems? You may make the presumption that their will be enough players left, but this is a dangerously provocative statement.
Unfortunately it all seems very straight forward but it is not. It must be dealt with diplomatically, so those who need to be are justifiably punished, whilst those playing fair are not negatively affected by this punishment, which may happen if we oust everyone.
Personally, drugs are for the weak, lazy and stupid.