There are indeed. But as far as I know, this is the only research done on the subject by the federal government directly. Doesn't it seem the least bit odd that of all the information published on all the websites maintained by the Justice Department, the DEA, and the ONDCP, ostensibly for "public education", there is no mention of it anywhere?
Uh, don't bother us with the facts, we will spin our report as the democrats that funded us want it spun.
"The Commission decided early in its deliberations to write a Report that was complete but not overly technical so that the reader could understand the points discussed without analyzing detailed studies."