In 2017, the hit that Anthony Barr (Vikings) put on QB Aaron Rodgers was legal. The hit ended Rodgers' season.
In 2018, the hit is now illegal.
Watch it again. That looks like a VERY CLEAN HIT! Ugh. 2018 in the NFL is gonna suck for defenders.
In an overview of new NFL rules and points of emphasis for the 2018 season, Pete Morelli said Anthony Barr's hit on Aaron Rodgers would now be a penalty, under the point of emphasis that prevents tacklers from putting their full body weight on a defenseless player.— Ben Goessling (@GoesslingStrib) August 2, 2018
Here's the exact wording from the video the NFL is showing to players and will show the Vikings tonight: "To further protect quarterbacks, when tackling a passer who is in a defenseless posture, the defender may not land on top of him with all or most of his body weight."— Ben Goessling (@GoesslingStrib) August 2, 2018