legal ground
Article 19 of the Measures for Health Supervision at Frontier Ports in People's Republic of China (PRC): (1) Patients with intestinal infectious diseases or carriers, patients with active pulmonary tuberculosis and patients with purulent exudative skin diseases shall not engage in the supply of food and drinking water; (two) engaged in food and drinking water supply personnel to conduct a health check every year, new employees first health check, check the qualified health certificate; (three) personnel engaged in food and drinking water supply should develop good hygiene habits, dress neatly at work, and strictly abide by the hygiene operation system.