HARRISBURG — A former Pennsylvania state senator’s conviction for using government employees to work on political campaigns was upheld Tuesday by a panel of federal appeals judges.

A 3rd U.S. Circuit Court of Appeals ruled against former Sen. Jane Clare Orie, saying her second trial in 2012 did not constitute double jeopardy and that the trial judge properly prevented testimony from a defense expert.

The appeals court said it was not a violation for the first trial to have been halted during jury deliberations because a forgery had just come to light that could have tainted the verdict.

“Forging evidence is one way to get a mistrial,” wrote Judge Stephanos Bibas, backing a state appeals court’s analysis that a mistrial was needed to counteract the fraud.

“Given the importance of the forged documents, the threat to the integrity of the verdict and the lack of a good alternative remedy, the only solution was a mistrial,” Bibas wrote.

Orie also argued she was improperly prevented from putting forth an expert on the topic of state Senate rules who supposedly would have testified that employees were able to use compensatory time to do campaign work from Senate offices.

The federal judges ruled that would have been immaterial, so her constitutional right to present her defense was not violated. “To convict, the jury had to find that she told her staff to do political work on the state’s time,” Bibas wrote. “And her expert testimony about what employees could do on comp time could not have affected that finding.”

Orie served most of a 2½-year minimum jail sentence for theft of services, conspiracy, evidence tampering and forgery.