Helmet-to-helmet collision - Wikipedia
https://en.wikipedia.org/wiki/Helmet-to-helmet_collision
• The Canadian Football League prohibits the use of the helmet to butt, ram, or spear an opponent. Players are penalized for what is not deemed to be an 'acceptable' football play. • In the NCAA, helmet-to-helmet collisions have been banned for years, but they were illegal only when intentional. In 2005, the NCAA took the word "intentional" out of the rules in hopes of reducing these incidents even further. Beginning with the 2013 season, players who are flagged for such …
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