The Supreme Court on Monday unanimously upheld a Nevada ethics law that governs when lawmakers should refrain from voting on official business because they might have a conflict of interest.

The court reversed a Nevada Supreme Court decision that said elected officials have a constitutional right to vote on official business that the state law violated.

The decision came in the case of Michael Carrigan, a Sparks, Nev., council member who voted on a casino project even though his campaign manager served as a project consultant.

Justice Antonin Scalia, writing for the court, said an elected official's vote "is not his own speech but a mechanical function of government — the commitment of his apportioned share of the legislature's power to the passage or defeat of a particular proposal."

Scalia said conflict-of-interest rules similar to Nevada's "have been commonplace for over 200 years."

The Nevada Commission on Ethics found that Carrigan's vote violated a provision of the ethics law that lays out various relationships that should disqualify an official from voting, including the official's relatives and business associates.

The ethics panel said Carrigan should have abstained from voting because his friend and campaign manager, Carlos Vasquez, also worked as a consultant for the Red Hawk Land Co., which was backing the Lazy 8 casino project.

The Supreme Court will decide whether a couple must pay taxes on the bankruptcy sale of their family farm.

The high court on Monday agreed to hear an appeal from Lynwood and Brenda Hall.

The Halls were forced to sell their family farm for $960,000 to settle their bankruptcy debts. That sale brought about capital gains taxes of $26,000. The Halls wanted the taxes treated as part of the bankruptcy, paying part of it and having the court discharge the rest.

The IRS objected to that plan, saying all of the taxes must be paid and the 9th U.S. Circuit Court of Appeals in San Francisco agreed with the tax agency.

The high court will review that decision.

The Ohio Supreme Court is investigating possible misconduct by the attorney who first tipped Ohio State's football coach to NCAA violations by his players.

Coach Jim Tressel's decision not to alert university officials to the tip from lawyer Christopher Cicero ultimately led to Tressel's resignation under pressure for failing to report the violations immediately.

State Disciplinary Counsel Jonathan Coughlan (COG'-linn) alleged in a filing Friday that Cicero violated professional conduct rules by revealing information from interviews with a potential client.

The filing cites three emails Cicero sent Tressel on April 2 and April 16. They contain details about Ohio State memorabilia discovered at a local tattoo parlor by federal investigators.