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It’s Waller’s second violation. He missed four games in 2016 due to a suspension for the same violation<p>Ravens tight end Darren Waller will miss all of the 2017 season (and potentially more time), due to violating the NFL’s substance abuse policy for the second time. This marks Waller’s second …

Read more at CBS Sports: http://www.cbssports.com/nfl/news/ravens-darren-waller-to-miss-at-least-a-year-for-violating-substance-abuse-policy/