NFL faces intense scrutiny over concussion protocols

Medical staff tend to Tagovailoa as he is carted off on a stretcher after an injury during the second quarter of the game against the Bengals. (Dylan Buell/Getty Images via CNN)

Medical staff tend to Tagovailoa as he is carted off on a stretcher after an injury during the second quarter of the game against the Bengals. (Dylan Buell/Getty Images via CNN)