The wonderful thing about having Canada as a neighbor was always knowing that its Molson-drinking, "eh"-affixing, health-care-socializing denizens were a mostly harmless bunch. Not any longer if you're U.S. drug czar John Walters. Wally is exercised about BC Bud, a high-grade, high-potency, high-price marijuana that will get smokers giggling quicker than the more mundane stuff grown in Mexico or that hollow out behind Uncle Billy's shed in Eastern Kentucky. Walters apparently has it figured that if the old-fashioned stuff could make the characters in "Reefer Madness" act so insanely, this nuevo-reefer must be, well, as bad as crack. "Canada is...