Posted by ESPN.com's Mike Sando
We move from dirty players to dirty teams to the unfortunate case of the Raiders, whose reputation for making their own rules apparently hasn't tarnished opponents.
Oakland has committed 109 personal-foul penalties since 2001, slightly more than average, but officials have flagged their opponents only 80 times, tied with Jacksonville's opponents for the league low.
The Raiders' differential, minus-29, is the biggest in the league.
We cannot know if the Raiders' opponents are getting a pass or if they are simply on their best behavior when they play Oakland.
Bills fans should have no such worries. Officials flagged Buffalo's opponents for 134 personal-foul penalties over the same span.
Officials flagged Carolina's opponents for 132 such penalties.
Buffalo's plus-35 margin was second-highest in the league behind Seattle's plus-36, a total reflecting the Seahawks' league-low 57 personal-foul penalties since 2001.
We'll break it down by head coaches a bit later (see you there, Bill Callahan).