(AP Photo/Carlos Osorio, File) DETROIT (CN) — A federal judge granted preliminary approval Thursday to a massive settlement for Flint residents who were poisoned by contaminated water. The settlement is currently worth more than $641 million and has been described as the “most complex settlement I’ve ever seen” by U.S. District Judge Judith Levy, a Barack Obama appointee who is overseeing the negotiations. “Generally, a settlement between an adult plaintiff and a defendant does not require court approval. But because this settlement presents a hybrid structure that includes a class component for unrepresented adults—and involves a substantial number of potential claims of Minors—preliminary approval of certain aspects of the proposed settlement is both appropriate and necessary,” Levy wrote in an opinion released Thursday morning.