IN 2004, law enforcement officials arrested 771,605 people for marijuana violations, according to federal statistics. Bruce Mirken of the Marijuana Policy Project was so alarmed he sent out a press release noting that there were more arrests for marijuana charges than all violent crimes combined. The number of arrests for possession alone was 684,319. Said Mirken of the 771,605 statistic: "This is, in fact, an all-time record. This number of arrests is the equivalent of arresting every man, woman and child in San Francisco." Some 40 percent of Americans say they have used marijuana or hashish in their lifetime, and...