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Residents say China used health tracker for crowd control

A woman wearing a face mask walks past a branch of a rural bank in Zhengzhou in central China's Henan Province, Friday, June 17, 2022. Angry bank customers who traveled to a city in central China attempting to retrieve their savings from troubled rural banks were stopped in their tracks by a common technology: a QR code. (Chinatopix via AP) A man wearing a face mask scans a QR code for a health monitoring app to enter a shop in Zhengzhou in central China's Henan Province, Friday, June 17, 2022. Angry bank customers who traveled to a city in central China attempting to retrieve their savings from troubled rural banks were stopped in their tracks by a common technology: a QR code. (Chinatopix via AP) FILE - A woman wearing a face mask carries a masked child stands against a board displaying a health QR code on Wednesday, May 18, 2022, in Beijing. Angry bank customers who traveled to a city in central China attempting to retrieve their savings from troubled rural banks were stopped in their tracks by a common technology: a QR code. (AP Photo/Andy Wong, File)