Drugged food is yet another safety concern to watch out for in China. A restaurant owner in Shaanxi Province has admitted to secretly infusing his noodles with poppy shells (from which opium is made) in order to keep diners coming back. The plan was reportedly working until he got caught. Police began their investigation after one repeat customer tested positive for opiates in a routine urine test and landed in prison for drug use. The doses the restaurant owner used were high enough to addict consumers over a long period of time. But this isn’t an isolated event. Restaurants all over China have been found to use morphine, codeine and narceine — all obtained from opium — as the “secret ingredient” in their foods.