SBI remains under fire in Peterson trial

Michael Peterson
December 8, 2011 2:54:36 PM PST
A former State Bureau of Investigation agent was once again under fire Thursday in the Michael Peterson trial. That agent's testimony is what helped convict Peterson. Now, Peterson's lawyer is questioning his credibility.

The defense is not only calling into question tests fired SBI agent Duane Deaver conducted in the Peterson case but also other cases. They're trying to show this was business as usual for Deaver and the SBI when they conducted experiments and testified in court.

Defense Attorney Diane Savage told the judge about a 2004 case in which she found glaring problems with Deaver's test results and testimony. Attorney Brad Bannon echoed that sentiment, recalling a case where the SBI blood spatter analysts were biased.

"He just made, in my view, very unproven, unscientific statements," said Savage.

"As he acknowledged over and over again, not in any effort to recreate any scenario of what happened that night but just to create stains that refute what our experts say that stain might look like," said Bannon.

Later in the day, another forensic expert trained in blood spatter analysis debunked Deaver's experiments in the Peterson case where he tried to show Peterson's wife died from a violent beating, not an accidental fall. Her greatest criticism of Deaver so far was that his tests failed to take into consideration all the possible variables in the stairwell where Kathleen Peterson was found dead.

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