Felipe Fernandez-Armesto was stopped by a plainclothes police officer after crossing a street in downtown Atlanta.
English assassin already provided the link.

Quote Originally Posted by Don
Why wouldn't the BBC talk to the Atlanta police department about it?
Because the APD made a mess and are unsurprisingly not commenting on the case, not even to the American press?

Police confirmed the professor was arrested and charged with disorderly conduct, said Officer Steve Coleman of the Atlanta Police Department. But Coleman told The Atlanta Journal-Constitution that more details of the arrest were not available Monday night and police would not be able to comment.