You may want to do your homework before going out to eat.A new report from the Center for Science in the Public Interest has evaluated inspection reports from 20 cities nationwide, detailing food safety hazards found in restaurants. More than half of the restaurants inspected had at least one high-risk food safety violation.Denver had an average of 1.2 violations per establishment inspected. Those violations include unclean food surfaces, employee handwashing, and improper holding temperature for food. Experts warn these violations can lead to numerous food-borne illnesses.CSPI wants all restaurants to post ratings on their front doors.The industry argues consumers can already get the information they need.For the full report go to www.cspinet.org. Denver's restaurant health inspection reports are at denvergov.org. Adams, Arapahoe, Douglas counties reports are listed on tri.co.gegov.com. Boulder county restaurants reports can be found at bouldercounty.org. Jefferson county inspections are listed at co.jefferson.co.us. For a listing of all other health department websites, visit cdphe.state.co.us.