NEW ORLEANS - Chevron Corp.'s attempt to prevent discovery by the Republic of Ecuador for the Lago Agrio contamination and personal injury litigation is judicially estopped because Chevron argues contrary positions with respect to the threshold issue of whether the dispute is pending in an international tribunal, a unanimous Fifth Circuit U.S. Court of Appeals panel held Feb. 13 (Republic of Ecuador, et al. v. John A. Connor, et al., No. 12-20122 $(consolidated$), 5th Cir.; 2013 U.S. App. LEXIS 3087).