Bad drug laws were probably in place before the private prisons came along. The private prisons simply took advantage of the bad laws in order to make a profit off the escalating prison population. The prisons more than likey lobby to keep the drug laws on the books.
The real problems are caused by the laws on the books which need to be changed. In order to get rid of the bad laws we would have to elect some different politicians who are in favor of liberty and individual rights like those endorsed by the Campaign for Liberty. Peace!
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