Where in the report is there an analysis of the efficacy of the existing laws? There is only a consideration of how the law as it existed should be applied based on the evidence. They were not charged with evaluating the efficacy of the law, and in fact at the time they did this study the law had just been passed. They had no historical data to judge it's efficacy on. Veracity counts. You get points deducted for spin.
"Our mandate was a broad one, covering, for example, the nature and scope of use, the effects of the drug, the relationship of marihuana use to other behavior and the efficacy of existing law.