A Flickr photoMason Tvert hasn't turned narc. He's seen wearing a Halloween costume.
April 20 isn't only the anniversary of the killings at Columbine High School. It's also 4/20, a national celebration of cannabis culture -- something long supported by Mason Tvert, executive director of SAFER (Safer Alternative For Enjoyable Recreation), who led the successful 2005 campaign to legalize possession of up to one ounce of marijuana for 21-and-up Denverites. However, events sponsored by SAFER on the