The rule, announced Thursday, will be in effect beginning July 15 at company-owned Starbucks locations in the United States.
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"This decision was based on a growing number of government mandates requiring individuals to wear facial coverings while in public as well as guidance from the CDC and other public health officials and partner feedback," a representative for the company told ABC News in a statement.
Starbucks said that customers who "may not be wearing a facial covering" at locations where a state or local government mandate is not in place will have other ways to place orders, including the drive-through, curbside pickup through the Starbucks app or place an order for delivery through Starbucks Delivers.
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"The company is committed to playing a constructive role in supporting health and government officials as they work to mitigate the spread of COVID-19," Starbucks added in a statement posted to its website.
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ABC News contributed to this report.