> where only the relatively safer and lower-concentration forms of a drug are legal? Partial legalisation of that type is likely to be counterproductive to ach

> where only the relatively safer and lower-concentration forms of a drug are legal? Partial legalisation of that type is likely to be counterproductive to achieving such a shift to safer forms of drugs. Trying to enforce (laudable and correct) principles such as "lower-concentrations are better and safer" with the coarse and brutal tool of the criminal law tends to be counterproductive -- there are far better tools of policy-making. As far as the criminal law and the police goes, they should keep their nose out of drugs except for pathological cases where there's actual criminal intent -- such as intentional / grossly negligent fuckups by drug manufacturers or people non-consensually dosing others or, say, drugged driving. Besides those sorts of exceptions, it should be impossible to get arrested/searched for any drug offences. Completely removing the selection pressures (those created by fear of law-enforcement actions such as search and arrest) towards easier-to-conceal drugs will, by itself, allow for exactly the shift back that you describe. Combining that with regulatory requirements for labelling, dose accuracy, and lack of impurities will allow people to safely use drugs in controlled accurate doses.