was a 42% decline in arrests per day of marijuana use; but does that count against the ratchet hypothesis? Perhaps not, as it is unclear whether scientific evidence has played much of a role, relative to changing attitudes, demographics and state budgets; and, of course, we would have a larger body of medical evidence on marijuana if not for the tenuous state of what passes for evidence-based policymaking in this domain.
Declaration of interestsNone.