Dolphins QB Tua Tagovailoa's injury sparks concern over the NFL's concussion policies

Miami Dolphins quarterback Tua Tagovailoa was carried out on a stretcher Thursday night in a game against the Cincinnati Bengals.

"It was a scary moment," Dolphins Coach Mike McDaniel said. "He was evaluated for a concussion and he's in the concussion protocol. He was at the hospital. I believe he's about to get discharged."

Earlier this week the league union said it would be investigating the Dolphins for its concussion evaluation process after Tagovailoa returned to the game following a hard hit in the first half in the team's Sep. 25 game against the Buffalo Bills.