JACKSON, Miss. — For a long time, if a body turned up in Mississippi it had a four-in-five chance of ending up in front of Dr. Steven T. Hayne.
Between the late 1980s and the late 2000s, Dr. Hayne had the field of forensic pathology in Mississippi almost to himself, performing thousands of autopsies and delivering his findings around the state as an expert witness in civil and criminal cases. For most of that time, Dr. Hayne performed about 1,700 autopsies annually, more than four for every day of the year and nearly seven times the maximum caseload recommended by the National Association of Medical Examiners.
During the past several months, in courthouses around Mississippi, four new petitions have been quietly submitted on behalf of people in prison arguing that they were wrongfully convicted on the basis of Dr. Hayne's testimony. Around 10 more are expected in the coming weeks, including three by inmates on death row.
The filings, based on new information obtained as part of a lawsuit settled last spring, charge that Dr. Hayne made "numerous misrepresentations" about his qualifications as a forensic pathologist. They say that he proposed theories in his testimony that lie far outside standard forensic science. And they suggest that Mississippi officials ignored these problems, instead supporting Dr. Hayne's prolific business.
For many around the state, the Hayne era is considered to be over and any problems fixed. In 2008, amid growing controversy, the state severed ties with Dr. Hayne, who to this day insists that he was treated unfairly. Mississippi officials have since shown almost no inclination to review his past cases.
The recent lawsuits suggest that in only a limited number of cases did a verdict most likely hinge on Dr. Hayne's testimony. But without any systematic review, it remains a question as to what that number may be.
"There are hundreds of cases that have to be reconsidered," said Dr. James Lauridson, a former state medical examiner in Alabama, who provided an affidavit in one of the recently filed cases. Dr. Lauridson said Dr. Hayne was an extreme example of a familiar problem: a forensic analyst with inadequate training who was given far too much deference in the courts.
"After you do that long enough, your initially shaky opinions become way out of the mainstream," Dr. Lauridson said. "That is what happened to him."
Dr. Hayne was sidelined by state officials after his analyses — and those of one of his close collaborators — led to several murder convictions that were later overturned or thrown out. But he insists that his work has been intentionally distorted by critics.
"I don't think I was treated fairly," he said last month at his house in a gated community overlooking the Ross Barnett Reservoir. "Is that the way you treat people after 20 years of working like a dog?"
A physician and pathologist, Dr. Hayne, now 71, began performing autopsies in Mississippi in the late 1980s. He served briefly as interim state medical examiner though he was not, as state law required, board certified in forensic pathology. From 1989, when he left the interim post, to 2010, the office of medical examiner was unfilled for all but five years. Dr. Hayne, working as a private contractor, almost single-handedly picked up the slack.
By his own count, he performed as many as 1,700 autopsies some years, in addition to having his own pathology practice. Dr. David Fowler, the chief medical examiner in Maryland and a former chairman of the standards committee for the National Association of Medical Examiners, called the number "beyond defensible."
Dr. Hayne said that state-appointed medical examiners simply did not have his motivation as a fee-based contractor, nor his work ethic. "How many autopsies could they do?" he said. "They could do one or 500, they get paid the same amount. Is there any incentive to do a heavy load?"
That incentive is at the heart of the challenges filed on behalf of prisoners in recent weeks, most of them by the Mississippi Innocence Project. The cases in those filings are not clear cut, and in all of them there is circumstantial evidence suggesting guilt and innocence. But Dr. Hayne's testimony was key.
In one case, Dr. Hayne performed an autopsy of a young boy and concluded he had been suffocated. Some weeks after the boy was buried, his 3-year-old brother told the police that he had been killed by his mother's boyfriend. Officials exhumed the body, and Dr. Hayne had a cast made of the boy's face. By comparing his initial notes of face wounds with the cast, Dr. Hayne testified, he found it probable that the boy had been suffocated by a large male hand. The boyfriend was convicted.
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