Despite the NFL's increased efforts to stop helmet-to-helmet hits, flags are still flying in 2013.
Although players know unnecessary roughness penalties will be called almost any time an official sees the helmet used as a weapon above the shoulders, the brain-rattling strikes are still happening.
However, some players have exhibited especially dirty play this season.
Heading into Week 8, here are the league's dirtiest defenders.
(Warning: You might be surprised where Ndamukong Suh ranks.)