I attended a Justice Stevens speech at my law school circa 1991.
He spent a lot of time discussing what he referred to as "Drug Prohibition" Thought it had a very distorting and pernicious effect on the court system. Was concerned with the way it ate up the budgets and time of the courts. Also thought the penalties were far too harsh and unnecessary. He had something of a libertarian viewpoint. But also practical based. Supply wasn't going to be reduced, people were going to take and abuse drugs, both legal and illegal. And criminalizing certain drugs was a very poor social response.
Stevens childhood coincided with alcohol Prohibition, and he very intentionally wanted to draw the parallel of a failed criminal response to common human behavior, the increase and in crime and criminal profits from the illegalization, the harm to violators, etc.
He led an interesting charmed life. Met Lindbergh and other celebs of the day, was there for Babe Ruth's legendary 1932 "called World Series home run. And made it back to Wrigley for the Cubs World Series in 2016.