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"A cloud of marijuana smoke formed a canopy over Porter Meadow on the University of California Santa Cruz campus Wednesday as students lit-up bongs and joints.The 4/20 smokeout tradition is not sanctioned by the university, but school administrators usually take a hands-off approach.This year's 4/20 had a different atmosphere as police maintained a high-profile presence.Campus police officers handed out citations around Porter Meadow for possession of marijuana, alcohol, and other drugs. One person was arrested for possessing a knife.Marijuana enthusiasts were not enthusiastic about Wednesday's increased law enforcement.\"I think the alcohol rule is stupid,\" UC Santa Cruz student Christian Raine Davies said.University spokesman Scott Hernandez-Jason said, \"We've increased enforcement this year trying to clamp down on the amount of people who attend.\"Last year, more than 5,000 students and Santa Cruz residents gathered for the smoke-out.Hernandez-Jason said, \"We estimate 60-70 percent of them are not even affiliated with campus.\"READ MORE: Presidents and politicians talk about smoking potEarlier in the week, UCSC Police Chief Nader Oweis sent a message to the campus community about a DUI checkpoint for 4/20.\"There are potentially serious consequences of choosing to attend. The Santa Cruz Area CHP will be conducting a DUI checkpoint near the west side of campus, aggressively seeking those who choose to drive under the influence,\" Oweis said.\"As a campus we are still processing the very recent horrific car accident on Highway 1 that involved UC Santa Cruz students. This tragedy included marijuana use,\" Oweis said.California Highway Patrol Officer Grant Boles said \"quite and few\" drivers were detained for driving while under the influence between 1 p.m.-5 p.m. at the checkpoint. Hundreds of vehicles were screened.Meanwhile, up in San Francisco, thousands of people descended on Golden Gate Park to smoke pot during what may be the last year marijuana is illegal in California.\u00A0\u00A0 \u00A0A legalization initiative is expected to be on the November ballot. The drug's use for medical purposes got approved in 1996.\u00A0\u00A0 \u00A0Voters in Nevada, Arizona and Massachusetts also are expected to consider marijuana legalization measures. And the Vermont Legislature is discussing a proposal to legalize the possession of up to 1 ounce.WEED LAWS: Where is marijuana legal?\u00A0\u00A0 \u00A0Recreational use already is legal in Colorado, Washington, Oregon and Alaska.\u00A0\u00A0 \u00A0The 4/20 pot holiday that some say has its roots in the San Francisco Bay Area will bring more police, park rangers and other officials this year to make sure it's safe for the 15,000 revelers expected to flood the park's Hippie Hill, Board of Supervisors President London Breed said.\u00A0\u00A0 \u00A0Crews have cleaned up more than 5 tons of trash in previous years, Breed said.\u00A0\u00A0 \u00A0The origins of the number 420 as a code for marijuana are murky. Some say 420 was once used by Southern California police to denote marijuana use.\u00A0\u00A0 \u00A0But others say the number became a code in the 1970s among high school students in San Rafael, north of San Francisco, who used it as a meeting time to gather to smoke marijuana after school."^^<http://www.w3.org/2001/XMLSchema#string>
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