The U.S. Supreme Court has declined to review whether a 2015 lawsuit alleging gross failures in the foster-care system should be treated as a class-action matter.
The Arizona Republic reported the high court decision means the case will proceed to trial as a class-action lawsuit.
Attorneys for the Arizona Department of Child Safety and the state's Medicare provider argue the lawsuit conflates problems that individual children have encountered with systemwide failures.
New York-based nonprofit Children's Rights has brought similar lawsuits in other states, arguing the problems are systemic and can only be solved with judicial intervention.
A trial date has not yet been scheduled.