Whether local government regulations prohibiting the purchase of new motor vehicles with specified emission characteristics--which are otherwise approved for sale by state and federal regulators--are preempted by the Clean Air Act, 42 U.S.C. § 7401 et seq.

Whether the Federal Reserve Board reasonably classified a fee imposed by a credit card lender because a consumer has exceeded the credit limit as one of the "other charges which may be imposed" under the account [15 U.S.C. 1637(a)(5)] rather than as a "finance charge" [15 U.S.C. 1605(a)], within the meaning of the Truth in Lending Act, 15 U.S.C. 1601 et seq?

Whether Section 1301, as amended, of the Indian Civil Rights Act of 1968, 25 U.S.C. 1301, validly restores an Indian tribe's sovereign power to prosecute members of other tribes, such that a federal prosecution following a tribal prosecution for an offense with the same elements is valid under the Double Jeopardy Clause of the 5th Amendment.