Pro football has changed over the last half-decade, under the looming presence of the now-settled concussion lawsuit, and with a heavier-handed enforcement system weaning players off old on-field habits.
But that doesn't mean there haven't been guys who continue to play on the edge of the rules.
And so this spring, new NFL executive VP of football operations Troy Vincent set out on an ambitious plan to reach those who've teetered on the boundaries of the league's new way of doing on-field business.
Vincent and the league identified 21 players in the "at-risk" category. In the group were the six players who have been suspended for hits over the last two years (Buccaneers safety Dashon Goldson, Titans safety Michael Griffin, Redskins safety Brandon Meriweather, Raiders defensive lineman Antonio Smith, Chiefs linebacker Joe Mays and Colts linebacker Erik Walden), and 15 others who were close to escalated discipline.