14 years after his original murder conviction, an expert testified that the main piece of evidence used to convict a former Akron Police Captain of his wife's murder did not have his DNA on it.

Lawyers for Doug Prade are arguing for either a new trial or his conviction be overturned. Testimony on Thursday focused on the lab coat which had blood from a bite mark on Dr. Margo Prade.

Dr. Julie Heinig, an Assistant Director of Forensics with the DNA Diagnostic Center, told the court that she ran the test on the blood-stained coat, and specifically looked for a male contributor. Her results from the test, done earlier this year, showed that there was a male contributor to the sample, but it was not Doug Prade.

The results also ruled out any male member of Doug's family.

The state is trying to argue that cross-contamination could have compromised the sample. They also played clips of Doug's original trial, where lawyers were presenting the evidence that they felt could have led to the contamination.

Testimony this time around is expected to last into Monday in Summit County Common Pleas Judge Judy Hunter's court.