Although it's become an annual and renowned event at [the University of Colorado at Boulder], this year's 4/20 celebration was different in some ways than in many previous years: The crowd was so large it migrated from the long-traditional site of Farrand Field to the larger Norlin quad; festivities kicked off earlier than normal with daytime concerts; and CU police handed out zero citations.
  "At this point, none are anticipated," said CU police Cmdr. Brad Wiesley.
  Officers in the past have gone to great lengths to catch people in the illegal act of smoking pot on 4/20.
  In 2006, CU police dispatched undercover photographers to snap pictures of smokers. Photos of 150 alleged offenders then were posted on the department's Web site, and witnesses were offered $50 to positively identify the suspects — who then were ticketed. Another year, smokers on Farrand were doused with sprinklers.
  "We can't do the same thing year after year," Wiesley said hours before today's smoking began. "So I doubt we'll do anything like the pictures. ... There's no way our 12 to 15 officers are going to be able to deal with a crowd of 10,000. We just can't do strong enforcement when we're outnumbered 700 or 800 to one."