In December, Nicolette Landi had tickets to see a Mariah Carey show at Madison Square Garden. But she was turned away at the door — she had been flagged by a facial recognition system and was, it turned out, on the arena’s watch list.

Ms. Landi was not a traditional security threat; she is a personal injury lawyer. The problem? Her firm was in a fight with the company that operates Madison Square Garden, and she had been caught in the middle.

Guest: Kashmir Hill, a technology reporter for The New York Times. 

Background reading: 

Madison Square Garden Entertainment, the owner of the arena, has put lawyers who represent people suing it on an “exclusion list” to keep them out of concerts and sporting events.Some have undermined the company’s ban by using a law passed in 1941 to protect theater critics.

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