NFL safety Kareem Jackson has been suspended for four games following a helmet-lowering hit on Vikings quarterback Josh Dobbs during Sunday night’s game. Despite initially going unflagged on the field, the league deemed the hit a serious violation of playing rules and informed Jackson of the suspension by letter today. This is not Jackson’s first suspension for this type of violation; he previously served a two-game suspension earlier in the season for similar violations against leading with the helmet. It is likely that Jackson will appeal this suspension as well, given his history of doing so. The NFL is keen to crack down on this type of behavior, as evidenced by Jackson’s ejection from two games and fines totaling four times this season for illegal hits. It remains to be seen whether he will be able to change his playing style in order to continue in the league.