Most notably the Ray Rice scandal. Since that story broke, the NFL has promised to devote more resources to fight domestic violence and paid for a domestic violence ad to play during the Super Bowl.
The ad plays a 9-1-1 call made by a woman who was pretending to order a pizza, so she didn't tip off her attacker.
Since the Ray Rice incident, the league has toughened penalties for domestic violence incidents. A first offense will result in a six-week suspension and a second offense leads to banishment from the league.
NFL Commissioner Roger Goodell addressed the issue during a news conference Friday.
"We want to make a difference in this area, not just internally but externally, we've done a great deal to bring more awareness to these issues; domestic violence, and sexual assault... we as the NFL want to make this an important issue, where we can make a difference in society in general because this is a problem in broader society," said Goodell.
Late last year the NFL owners approved a new personal conduct policy, but it still has to be approved by the player's union.