"The Chinese government responded to toilet-paper thieves in Beijing's public restrooms by installing dispensers with facial-recognition software, which allows each visitor only one sheet, approximately two feet in length, every nine minutes. 'The sheets are too short,' said one visitor." (Source: Harper's Weekly Review, Online, March 24, 1957)
Which raises the question: Why do Beijing residents steal toilet paper? China is where paper was invented, it ought to be cheaper than rice.