In determining when a hit is inappropriate, Supreme Court Justice Potter Stewart said it best in reference to pornography: "I know it when I see it."
SNYDER: With all the rule changes, has the NFL started to become too non-violent? →
Supreme Court Justice Potter Stewart once said of pornography, "I know it when I see it," and now we all see it everywhere.
L. DAVID PERRY: Don't let pornography be the Grinch this holiday season →