It must be fairly expensive as, at a park in Beijing, they are using toilet paper dispensers with facial recognition to stop visitors from taking too much paper. Machines at the park scan visitors' faces before dispensing a fixed length strip of paper about 24 x 27.5 inches to each person.
More paper is not dispensed to the same person until after nine minutes have passed.
"If we encounter guests who have diarrhea or any other situation in which they urgently require toilet paper, then our staff on the ground will directly provide the toilet paper," a park spokesman said.
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