As the National Football League enters the offseason, Commissioner Roger Goodell must still confront problems that have plagued the NFL all year: domestic abuse, the long-term damage of concussions and a looming probe of "DeflateGate." Adrian Peterson and Ray Rice are eligible to play next season, even after facing legal action for domestic violence cases that sparked contentious debate over the league's personal conduct and domestic violence policies. The league is also fighting to prove it is doing enough to prevent concussions and brain damage. Goodell said Friday it had been a year of "humility and learning" for him and for the league.