U.S. Supreme Court Justice Amy Coney Barrett’s first opinion in an argued case, issued Thursday, marked a departure from an informal practice of unanimous debut opinions in recent years.

Barrett led the 7-2 majority in the case U.S. Fish and Wildlife Service v. Sierra Club in ruling against the environmental group’s argument that the Freedom of Information Act required the government agency to disclose a draft biological opinion analyzing the impact of a proposed clean water rule on endangered species.