Most Chinese social media users think it's a good idea, and many point out that it could be used for missing persons cases, too. "Get abducted children on a few packs!" one person writes on the Sina Weibo microblogging site. But others are baffled by the police force's choice of playing cards, given that gambling is illegal in China. One user asks if police are "encouraging people to gamble", and another declares: "This type of card I don't dare to play with!"