Prohibition laws are not enforcable. See history. Note that you can get drugs in any penitentiary in spite of the walls & guards.
Unenforcable laws lead to increased crime. See the history of the Great Experiment, which was resposible for the success of Al Capone, of Dutch Schultz (up till he got shot), et alia. They didn't want to see Prohibitiion repealed, and indeed repealing Prohibition did put that crowd out of the alcohol business, but no worry, it left their organizations in place.
And corruption increased; there was a lot of money floating around from bootleg alcohol, so 'respectable' bankers were money -laundering, judges and lawmakers and cops were taking bribe money. Just like it is with drugs now.
Unenforcable laws also lead to a general disrespect for law.
It is not possible to effectively prohibit drugs, weapons, or books as long as people want them, and you mess things up when you try.