"Greater control" of a drug is in practice the opposite of prohibition. Ineffective efforts at total prohibition - and they are always ineffective - means that there is no control whatsoever. No control on purity, no control over the circumstances in which they are used, no control on the age at which they are used.

It just doesn't work. It's been given an awfully long time to see if somehow it might start to work. It's time to stop pretending, and try it another way.