Explaining the NFL's latest concussion controversy and policy change

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The NFL is once again under fire over concussions.

After Miami Dolphins quarterback Tua Tagovailoa sustained a pair of big hits, the second of which left him needing to be carted off the field, the league and its players' union opened an investigation and said it would review its concussion policy.

Over the weekend, the investigation findings were released and the league announced it would change a key element of its concussion policy, effective immediately.

Now, all eyes are watching closely to see how officials handle concussions as the NFL heads into the sixth week of its season.