The German plan would also allow home cultivation of three cannabis plants per adult.In the US, 37 states and Washington DC have legalised medical cannabis, while 19 states have approved it for recreational use.German ban 'unsuccessful'Presenting the plan, Mr Lauterbach said decriminalisation would help protect the health of young people, because the cannabis ban had had "no evident success" in recent years.He said the government would consider a possible restriction on the maximum strength of cannabis products sold to adults aged under 21.Besides sales tax (VAT), the price of regulated cannabis sold would also include a government "cannabis tax"."