The NFL announced the suspension on Thursday. The punishment
begins immediately and prevents Gregory from playing for Dallas
in the playoffs.
All three of Gregory's suspensions have come in the past year.
He served a four-game suspension at the start of the 2016 season
and then served a 10-game suspension for his second offense.
Gregory also failed a drug test for marijuana at the NFL combine
in 2015.
Gregory, a second-round pick, played in Weeks 16 and 17 of this
season and recorded his first career sack.
(Editing by Frank Pingue)
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