The tech was in use at Taylor Swift’s Rose Bowl shows. (Getty Images)

When Taylor Swift played in May at the Rose Bowl in Pasadena, Calif., she appeared before more than 60,000 screaming fans, mostly made up of groups of young girls, preteens, teenagers and their parents. And if the Rose Bowl security team was successful, none of those people were on the list of more than 1,000 stalkers, harassers and assorted kooks that law enforcement had put together, people that Swift and her ...

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