BOISE, Idaho -

The Idaho Court of Appeals has upheld the conviction of a man who said misconduct at an Idaho State Police laboratory discovered after his sentencing would have changed the outcome of his case.

Wally Kay Schultz pleaded guilty in 2007 to possession of methamphetamine and was sentenced to five years in prison. But in 2011, he received a letter indicating the Idaho State Police had discovered misconduct at the forensic laboratory that tested the drugs in Schultz's case. The letter said the lab scientists kept a secret box of drugs that they used for training and hid from auditors.

Schultz contended that if the misconduct had been known he wouldn't have been convicted.

But the appellate court disagreed, saying Schultz failed to show the misconduct affected his case.