That's not true. It took me all of about 10 minutes doing searches on Rush's site to find plenty of recent statements supporting the war on drugs. Some examples:
"Someone needs to remind Justice Kennedy that it's the legislative branch, not the Supreme Court, which makes law. Mandatory minimums are totally constitutional. And these tough sentencing laws were instituted for a reason. The American people, including liberals, demanded them. Don't you remember the crack cocaine epidemic? Crack babies and out-of-control murder rates? Liberal judges giving the bad guys slaps on the wrist? Finally we got tough, and the crime rate has been falling ever since, so what's wrong?"
"This got me thinking about the differences between liberals and conservatives, which are substantive, and how conservatives would never leave this country. But if these Democrats want to flee to Canada, then by all means let's not stop them. That's just less people in this country voting Democrat. In fact, let's come up with a way to encourage them by sending them to a nation where there are high national income and sales taxes, they cuddle up to dictators like Castro, say the U.S. is evil, have no military, seek to legalize drugs - in short, a nation where all liberal dreams have come true (and turned into nightmares)."
"I go into detail about these non-thinking talking points that `you can't tell people what to do with their bodies' and `you can't legislate morality.' First of all, we tell people what they can do to their bodies all the time - no cocaine, no prostitution, no throwing yourself off a building. Second, laws are nothing but defining morality!"