Many countries have now decided not to use the full weight of criminal sanctions against people who are in possession of drugs that are for their personal consumption. The Conventions say that there must be an offence under domestic criminal law, it does not say that the law has to be enforced, or that when it is what sanctions should apply. . . . Despite such grey areas latitude is by no means unlimited. The centrality of the principle of limiting narcotic and psychotropic drugs for medical and scientific purposes leaves no room for the legal possibility of recreational use. . . . Nations may currently be pushing the boundaries of the international system, but the pursuit of any action to formally legalize non-medical and non-scientific drug use would require either treaty revision or a complete or partial withdrawal from the current regime.