March 19th, 2013- Defensive players have complained in the past that they are not protected as much as offensive players (namely quarterbacks). The NFL has heard their plea and decided to make a change. Defensive players are now protected from being blocked in the knees from behind, after a vote to change the league's rules today.
This rule change will go into effect for the 2013 season and figures to be popular among players. The rule on low blocks will cover the whole field as opposed to before where low blocks from behind were most of the field but allowed inside the tackle box.
NFL defensive players have complained that rule changes have been made to protect offensive players' heads, but defensive players kept getting knee injuries due to no protection from these types of hits.
There are more rules up for a vote including changing the tick rule, replay challenges and players lowering their helmets which has caused a lot of talk lately. Votes on these topics will come soon.