Amon-Ra St. Brown passed all concussion testing on the sideline after he was pulled from Sunday's 24-6 loss to the Dallas Cowboys, but the Detroit Lions second-year receiver could not return to play because of a change to the NFL concussion policy instituted earlier this month.
"My understanding is he looked a little disoriented, certainly, and then go to the (medical) tent (for further evaluation) and you’re going to go through the whole process of clearing him, and in the meantime they look at the video," Lions coach Dan Campbell explained Monday. "So when they see the video plus what they saw there, it’s automatically you’re out now.