In the US we have a controlled drug scheduling system; schedule 1 are drugs of abuse with not medical uses like heroin, pot, meth etc.. Sch 2 are medical drugs that are highly controlled and monitored by the DEA like morphine, amphetamines, and it goes down from there to schedule 5 meds which are considered worth monitoring but having minimal addictive properties.
The whole thing is really BS and not science based.