In two separate cases – one under Texas law and one under Louisiana law – the Fifth Circuit has reinforced the principle that a 30-day notice provision in a pollution exclusion buy-back clause is strictly enforceable, and an insurer does not need to demonstrate prejudice to deny coverage. In these cases, the Court found that this outcome was consistent with the Court’s prior decision in Matador Petroleum Corp. v. St. Paul Surplus Lines Ins. Co., 174 F.3d 653 (5th Cir. 1999), and the Court found that this principle of enforceability was not changed by subsequent notice-prejudice cases.