The NFL is investigating whether the Redskins committed tampering in their pursuit of defensive tackle Albert Haynesworth, according to Yahoo! Sports. The Titans, who registered charges in late March, were trying to re-sign Haynesworth after last season, but believe they were interfered with by the Redskins. Tennessee is accusing Washington of contacting Haynesworth and his agent, Chad Speck, before the free agency period started Feb. 27.