To get into the Vancouver School of Drug War History and Organic Cultivation, would-be cannabis buyers had to first answer a skill-testing question that showed they had taken part in a one-hour walking tour. “The cops… tried getting access to the school just by tapping on the window like everyone else did, and they were asked for a drug war history walking tour fact,” said David Malmo-Levine, once referred to as a “prince of pot”…