NASCAR went deeper South than usual over the weekend, holding a Busch Series race in Mexico City. The race was hailed as a success (more than 90,000 fans showed up), Robert Weintraub reports, thanks in part to NASCAR handling details like extra security to keep its drivers from being kidnapped. But the crooks aren't the only people you have to worry about below the border. NASCAR told its competitors: "Be wary of persons representing themselves as Mexican police or other officials. This can prevent you from becoming a victim of harassment and mistreatment by Mexican law enforcement."