fMRI Makes Sentencing Debut

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Last month, we looked at a case in Italy where a murderer got time off his sentence for having a gene linked to violence. Now, we have a case out of Chicago where a murderer tried to use fMRI evidence at sentencing to avoid the death penalty.

Here’s what happened, from Science Insider:

For what may be the first time, fMRI scans of brain activity have been used as evidence in the sentencing phase of a murder trial. Defense lawyers for an Illinois man convicted of raping and killing a 10-year-old girl used the scans to argue that their client should be spared the death penalty because he has a brain disorder.

The defendant, Brian Dugan, pleaded guilty in July to killing Jeanine Nicarico after kidnapping her from her home in 1983. (Prior to that, the Nicarico case had taken more turns than a hangman’s knot, detailed in a 1998 book Victims of Justice). Dugan was already serving life sentences for two other murders, but prosecutors sought the death penalty for Nicarico’s murder.

“Nobody thought we had any chance at all going in,” says Steve Greenberg, the lead attorney for the defense. But the defense tried an unusual strategy: They argued that Dugan was born with a mental illness—psychopathy—that should be considered a mitigating factor because it impaired his ability to control his behavior. Dugan exhibits the antisocial behavior, inpulsivity, lack of remorse, and other characteristics of psychopathy in spades, says Kent Kiehl, a neuroscientist at the University of New Mexico, Albuquerque, and the Mind Research Network, who served as an expert witness for the defense. Dugan scored 37 out of 40 points on the standard diagnostic checklist for psychopathy, putting him in the 99.5th percentile, Kiehl says.

Kiehl conducts research on psychopathy in New Mexico state prisons in which he and colleagues collect life histories, anatomical brain scans, and fMRI scans of brain activity as inmates perform various tasks, including tests of moral reasoning. Using scanners at Northwestern University, Kiehl ran Dugan through a similar battery of tests. Kiehl testified that Dugan exhibited abnormalities similar to those he and others have reported in other psychopaths. Kiehl says he was careful not to stretch beyond what the data show. He didn’t claim, for example, that the brain scans prove that Dugan committed his crimes as a result of a brain abnormality. “It’s just one piece of evidence that his brain is different,” he says.

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Although evidence of anatomical abnormalities in the brain has been introduced previously in the sentencing phase of murder cases, and PET scans have been used to show abnormalities in brain metabolism consistent with mental illness, the Dugan case may be a first for fMRI. “I don’t know of any other cases where fMRI was used in that context,” says Hank Greely, a professor at Stanford Law School and co-director of the MacArthur Foundation Law and Neuroscience Project. Greely notes that the standards for admitting evidence in sentencing hearings are less stringent than those for evidence used to establish a defendant’s innocence or guilt. “The penalty phase of a capital case … is a special situation where the law bends over backwards to allow the convicted man to introduce just about any mitigating evidence.”

The tactic wasn’t terribly successful, though: “After 5 hours of deliberation the jury told the judge on 10 November that they’d come to a decision. But before the sentence could be read, the jury asked for more time and the judge sequestered them overnight. The next day they returned with a death sentence for Dugan.”

The defense attorney gives things a more positive spin: “This guy was guilty of raping and killing little girls,” Greenberg says. “Without the brain imaging stuff the jury would have been back in an hour.”

Not sure that counts as a victory for fMRI in the courtroom. But it’s a start.