The U.S. supreme Court has agreed to resolve an immunity question of its own making-one around which prosecutors must tread carefully nearly every working day.

As part of the fallout from the tax prosecution of former Associate Attorney General Webster Hubbell by Independent Counsel Kenneth W. Starr, the justices will decide this term when prosecutors can use documents against a defendant who is required to produce them while under a grant of immunity. U.S. v. Hubbell, No. 99-166.