The NFL agrees with Brees.
NFL Media Insider Ian Rapoport reported Wednesday that Brooks was fined $15,750 for the hit on Brees. That's the standard fine for a first-time offender. After reviewing the play, the league decided that the personal-foul penalty was just.
Rapoport also reported that Brooks will appeal the fine, according to a source who has spoken to the linebacker on the matter.
"You can't make forcible contact to the head or the neck area, even if the contact starts below the neck and rises up," NFL vice president of officiating Dean Blandino said on Tuesday's edition of NFL Network's "NFL Total Access."
"If there's force to that contact, it's a foul," he added. "Watch the initial contact, maybe around the shoulder, but it rides up into the neck area and brings the quarterback down with force."