Justice Stevens also filed a dissenting opinion in which he said there was "no obvious limiting principle" to the majority's analysis.

While also joining the majority, Justice Thomas filed a separate opinion emphasizing the role of school choice on the opportunities available to poor urban children.

He is expected to file a detailed written opinion in coming days.

Justice Stevens had not signed that opinion, filing a dissenting opinion of his own instead.

In the same case, Judge Dyk filed a concurring opinion to similar effect.

Justice Kennedy filed an opinion upholding the regulation on different grounds.

Justice Scalia agreed with the result but filed a separate opinion.

Justice Kennedy filed a brief concurring opinion indicating some unease about his vote.

Justice Clarence Thomas filed a separate opinion agreeing with the result.

John P. Stevens filed a concurring opinion in the result.