The U.S. Food and Drug Administration has a marijuana problem. On April 20 of this year, the FDA rejected marijuana for medical uses. The FDA said, "no sound scientific studies supported medical use of marijuana for treatment in the United States, and no animal or human data supported the safety or efficacy of marijuana for general medical use." This conclusion contradicts a lot of other scientific research and expert conclusions, including that of the National Academy of Sciences and the FDA itself. In 1985, the FDA was so convinced of marijuana's medical benefits that it approved Marinol and Cesamet, both...