From China Digital Space
钓鱼执法 (diàoyú zhífǎ): entrapment (literally “enforce the law by fishing”)
Entrapment is when a law enforcement agent induces a person to commit an offense which the person would otherwise have been unlikely to commit.
Perhaps the best known example of entrapment in China is the October 2009 case of Sun Zhongjie. A new driver for a Shanghai construction company, Sun was stopped by a man on the side of the road, shivering in the cold. The man asked for a ride, and Sun complied. Though Sun did not request it, the man handed Sun money when he reached his destination. Next, the man revealed his identity as an undercover police officer and detained Sun for driving an unlicensed taxi. Sun's conviction was overturned after netizens let loose a torrent of pressure.
The Sun Zhongjie case is parodied in the video “War of Internet Addiction.”
A nearly identical case, dubbed “Fishing Gate” occurred a month earlier in Shanghai.