Mealey's (October 13, 2020, 12:20 PM EDT) -- NEW ORLEANS — A lack of reliable expert testimony showing that a man was injured by exposure to oil and chemical dispersants while helping clean up the Gulf of Mexico after the Deepwater Horizon oil rig explosion dooms his claims against the rig operators, the Fifth Circuit U.S. Court of Appeals agreed in affirming exclusion of an expert’s opinions and summary judgment for the operators on Oct. 12 (Blaine McGill v. BP Exploration & Production Inc., et al., No. 19-60849, 5th Cir., 2020 U.S. App. LEXIS 32208)....