A pedestrian walks past a Chipotle Mexican Grill in Beverly Hills, California, March 7, 2011. Chipotle, based in Denver, is one of the highest-profile employers to come under the scrutiny of the Immigration and Customs Enforcement (ICE) in recent years. The investigation into its hiring practices has served as a wake-up call for the nation's nearly 580,000 restaurants. REUTERS/Gus Ruelas (UNITED STATES - Tags: EMPLOYMENT BUSINESS POLITICS)