A defense witness is questioning DNA evidence in the Laci Peterson murder case in Modesto. State University of New York biology professor William Shields says the type of D-N-A test was used on hair found in Scott Peterson´s boat is unreliable. Shields told a pre-trial hearing he was “appalled” by the sample size used in the testing.
Prosecutors believe the hair could be from Laci Peterson. Scott Peterson is charged with killing her and the baby boy she was carrying. The “mitochondrial DNA” technique is rarely used in California courts, and prosecutors must satisfy some legal hurdles before it can be introduced.