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Christian McCaffrey is one of several rookies who were unable to report to their teams until this week<p>The NFL’s quarters rule is one that has been mired in controversy since its inception in 1990. It’s back in the news after it kept Christian McCaffrey from reporting to the team’s offseason program …

Read more at CBS Sports: http://www.cbssports.com/nfl/news/quarters-rule-for-nfl-rookies-what-it-is-why-it-exists-why-its-controversial/