It's a very good question. I think there are a couple of components to that.
When we go back to the 2008 report, which was at the time we were just starting to get the investment return in terms of starting to hire some of the drug-detector dog teams, security intelligence officers, etc., there wasn't as much of a gain being accrued. Now I'm quite confident in saying that the gains we are accruing are partly attributable to that investment, but not entirely. Some of it as well is linked to having offenders participate in the programs. There's no question that when offenders feel comfortable and safe going out and getting into the programs, some of them are starting to turn their lives around, and we continue to move forward.
So there are many different factors in terms of looking at those numbers. You're absolutely correct in terms of your observation around the discounting of prescription meds in the earlier number, but as we go forward we truly are seeing a reduction in the drugs.
One of the things that is evident for us is the types of drugs that are being used. The more effort we put into the interdiction, some of the more serious drugs—all drugs are serious in my mind, but I think you'll appreciate what I'm going to say here—are not showing up in the positive tests.