A Connecticut attorney who made his first trip to the U.S. Supreme Court just saw his case land a big win after the justices issued a unanimous ruling in a case involving tribal immunity.

The justices, in an 8-0 opinion Tuesday, overruled a Connecticut Supreme Court that found the underlying personal injury case could not proceed to trial because the defendant, a tribal casino employee, had sovereign immunity.

In an opinion written by U.S. Supreme Court Justice Sonia Sotomayor, the court ruled that the real target of the personal injury suit involving a two-car accident was the casino's limousine driver, and not the tribe or a tribal office. This meant the tribe's sovereign immunity was not implicated.