The drug treatment courts are not dealing with the largest proportion of the drug offences in the country. The drug treatment courts are really dealing with a very small subset of offenders who fit the criteria. In other words, they are non-violent, they are not exploiting children, and they are not engaged in commercial trafficking. They are people who the system--the prosecutors, the defence--have agreed are possibly candidates for treatment. That's the purpose of the drug treatment courts.
When you refer to drug courts, yes, in certain courts 90% to 100% of the business is drug cases, but they're dealing with all kinds of drug cases--trafficking, simple possession, everything. The drug treatment court is a special subset of drug courts in general.