BP is scaling back its cleanup efforts from the Deepwater Horizon oilspill in areas outside Louisiana. Here, a photo from last September shows alluvial clay and tar mats on the shore of Elmer's Island, in Jefferson Parish, La. Gerald Herbert/AP hide caption

itoggle caption Gerald Herbert/AP

David Rainey, a former BP vice president during the Deepwater Horizon oil rig explosion, leaves federal court after being arraigned on obstruction of a federal investigation in New Orleans on Nov. 28, 2012. A federal judge Monday dismissed the charge that Rainey obstructed a congressional investigation into the 2010 spill. Matthew Hinton/AP hide caption

itoggle caption Matthew Hinton/AP