My idea would mean that less non violent offenders are put into our already overcrowded prisons. If some drugs were reclassified, it would also make help for addicts more accesible.
View the latest research and papers in psychopharmacology and (re)classify drugs acccordingly. Also, take on board all the experts have to say on the matter. Afterall, they are the experts with (depending on the source) no hidden agendas, bias or vested interest.