This suspension could end up costing McClain his $750,000 signing bonus.
Last year, McClain served a four-game suspension for violating the league’s substance-abuse policy, so this is hardly the type of news that the Cowboys want to hear.
McClain elected to skip the team’s OTAs, but was arrived in time for the start of mandatory minicamp.
McClain, 26, is a former first-round pick of the Raiders back in 2010. He spent three years in Oakland before taking a year off and later signing with the Ravens.
Baltimore traded McClain to the Cowboys in 2014, and Dallas elected to bring him back on a one-year, $5 million contract back in March.
In 2015, McClain recorded 80 tackles, two sacks, an interception returned for a touchdown, and three pass defense.