Germany fully legalized and regulated prostitution some years ago. The last thing I've heard is that it's lead to an increase in illegal prostitution practices

Germany fully legalized and regulated prostitution some years ago. The last thing I've heard is that it's lead to an increase in illegal prostitution practices (taffickin, coercion) because the regulation is not enforced well and it's easy to have illegal practices behind a legal front. Obviously, this should be solvable through better regulation enforcement - but there doesn't seem to be the political will to pay for that...