FRISCO (CBSDFW.COM) – Dallas Cowboys defensive lineman David Irving has been suspended for the first four games of the 2018 regular season for violating the NFL’s substance abuse policy, according to a league spokesperson.

Irving will be allowed to participate in all offseason and preseason practices and games.

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He will be eligible to return to the team’s active roster on Monday, October 1 after the Cowboys’ game against the Detroit Lions.

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The defensive lineman was suspended last June for the first four games of the 2017 regular season for violating the NFL’s performance-enhancing drug policy.

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Dallas will open up its regular season on September 9 against the Carolina Panthers.