rules are always evolving.
As the preseason gets set to begin around the league, NFL referees will be asked to emphasize specific rules that the league and players are hoping to hammer down in the minds of coaches, players and fans.
If there's an abundance of flags for the same infraction, it's likely by design. Each season, the NFL emphasizes a few rules--new or old--to make sure the entire sport is on board before the regular season begins in September.
Here are the point-of-emphasis rules for 2017, per the NFL.