One of the reasons Amsterdam and Rotterdam had such an open-city attitude to drugs and prostitution is that they are huge port cities which facilitates illicit trade. It is more difficult when your major ports of entry are rail or airport hubs. Bickerdike quay in Montreal is infamous for that. It is controlled by the Irish West End Gang which does business with the russian/south american/italian and middle eastern mafia. They export stolen cars to those countries import cocaine and heroin etc... That is one of the reasons Montreal was a loose city like Nahwlins when it comes to prostitution and drugs. Big international harbor. But I wouldnt wish more of that on Detroit, legit or no.