It's very difficult to get those numbers. I think there are studies that are starting. I wouldn't say that they have concluded about what the actual costs alone of, say, a change in cannabis policy is. It depends on a lot of things.
For example, we haven't discussed today, how will cannabis use changes in young people affect alcohol use changes? We know that among young people—heavy users, arrestees, those in treatment—alcohol and marijuana are used concurrently; they are complements. If cannabis use increases because of a certain policy, then what that does to alcohol use, because of the great monetary damage that alcohol has, will greatly affect that overall number. So there's tremendous uncertainty.
We do know there are costs. We can at least lay out the categories that we would look at. You just laid out two of them. Productivity, I would say, is a key one, especially with regard to cannabis, and motivation, which we haven't really talked about today. Health care costs are going to be higher. We have to also look at what Mr. Perron said on road safety and public safety costs. Those numbers haven't really been done; those studies have not been done on the raw numbers...only looking at the categories that they would actually affect.