China's business hub of Shanghai will use mobile testing units it says can verify the safety of most food within 30 minutes, as fears grow at home and abroad over contaminated Chinese products ranging from cough syrup to pet food. All districts of the city have been equipped with "food safety testing vehicles and personnel," eliminating the need for expensive and time-consuming laboratory tests, the official Xinhua News Agency said in a report issued late Wednesday. "The system can tell the safety of most food products within 30 minutes," Li Jie, deputy director of the Shanghai Food and Drug Supervision...