A federal appeals court has upheld the conviction of Franklin Brown, the former general counsel of Rite Aid, on fraud and obstruction charges in connection with the $1.6 billion accounting scandal that sent half a dozen executives to prison and cut the company’s stock price in half.

The unanimous three-judge panel rejected Brown’s claims that both the prosecutors and judge had engaged in misconduct, and that secretly recorded tapes of his conversation with another executive had been tampered with.