Soooo busted.

EVERYONE KNOWS EARTH DAY IS April 22, but certain circles also celebrate Hemp Day on April 20. The date corresponds with 420, the code a group of high school students developed in 1971 to meet at 4:20 p.m. to smoke marijuana. When University of Colorado at Boulder, students tried to gather on Farrand Field on April 20 this year, they were greeted by signs announcing the field was closed and under video surveillance. Some went onto the field anyway. CU-Boulder's police posted these students' pictures on a website and offered a $50 reward for positive identifications. CU spokesman Barrie Hartman says identified students are being cited for violating student conduct rules for trespassing. Last year, officials turned on the sprinklers during the 420 gathering. "Our first priority is the safety of our students," he says, adding that the 2,500 students who gathered behaved very well. Because of the public's ambiguous view of marijuana, Hartman calls the event a lose-lose situation for public perception, saying it would be easier to respond if underage drinking were occurring, but "when they violate the law, we have to have a response." Three students have responded by suing the university for violating their First Amendment right to peacefully assemble. The university has been quoted as saying it has the right to close buildings or fields and will fight the lawsuit.