That [i]could[/i] be a reasonable thing to in a few years. There are a lot of institutions collecting data from states where MJ has been legalized and decriminalized. One of the more alarming finds is that the homeless population has increased these places. It will be a few years before anyone can tell if this is actual homelessness or just a new kind of long term tourism. The next 3-5 years in science will be crucial for legalization.