Scott Peterson pins hope for 'unlikely' appeal on duct tape DNA testing in pregnant wife's murder, expert says

Twenty years after he was convicted for the murder of his wife and unborn child, Scott Peterson hopes that further DNA testing of evidence could win him a retrial — but a former California prosecutor with knowledge of the case said his chances are "unlikely." 

In an order filed on July 24, a judge decided that a 15.5-inch piece of duct tape recovered from Laci Peterson's pants at her autopsy on April 13, 2003, must undergo DNA testing. 

Pure Gold Forensics, Inc. will conduct the test on the tape...