Every so often, a package of marijuana arrives in Jason B. West’s mail at the University of Utah in Salt Lake City. While Dr. West may not be the only one on campus receiving deliveries of illegal drugs, he is probably the only one getting them compliments of the federal government. Dr. West’s marijuana supply is decidedly not for consumption. It is meticulously cataloged and managed, repeatedly weighed to make sure none disappears, and returned to the sender (a laboratory at the University of Mississippi) or destroyed when he is done with it. With financing from the Office of National...