Redskins outside linebacker Rob Jackson, who started 14 games last year and notched 4.5 sacks and four interceptions, has been suspended for the first four games of 2013 after testing positive for a banned substance, according to multiple reports.
The Washington Post cited two sources, one who said the suspension was for use of an unprescribed pain medication. The other source said Jackson is appealing the suspension but did not say what it was for.
Jackson, 27, became a starter after Brian Orakpo tore his pectoral muscle in Week 2. He made 37 tackles and ranked second on the team in sacks and interceptions.
This month, Jackson signed a one-year deal to stay in Washington. He'll be allowed to participate in offseason workouts and preseason games.