Is there any solid data on impact of 2009 Ogden medical marijuana memo?

This week in my marijuana seminar we will be watching and discussing the terrific (though already dated) documentary “Code of the West” about medical marijuana reforms in Montana.  Among the many stories effectively documented by this movie is the important reality that, while Montana enacted via voter initiative medical marijuana reforms in 2004, the medical marijuana industry in the state only became active and prominent after the issuance of the 2009 Ogden Memo. This memo from the Obama Administration’s Justice Department stated that the federal government would not prosecute “individuals whose actions are in clear and unambiguous compliance with existing state laws providing for the medical use of marijuana.”

In addition to the coverage of this story in Montana in this great documentary, I have seen a number of anecdotal reports about how the medical marijuana industry kicked into high gear in many western states as a result of the 2009 Ogden Memo, especially states like California, Colorado and Washington. But, to my knowledge, nobody has yet done any systematic research on the impact of the Ogden Memo, in individual states or nationwide, on the number of state-compliant medical marijuana dispensaries or the number of persons working in and around the medical marijuana industry or the number of persons registered for or regularly obtaining marijuana in conjunction with a doctor’s recommendation.

I am busy trying to finish an article complaining about the lack of rigorous social science research surrounding the real impact of state-level marijuana reforms, and I am especially intrigued and troubled by how little systematic data I can find concerning the medical marijuana industry and users. If anyone knows of any significant recent data collections or other research on these fronts, please let me know.