sciencehabit writes "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. Some experts say the scans are irrelevant because they were taken 20+ years after the crimes were committed. Others point out that the scans are only being considered because the sentencing phase of a trial has less stringent standards about evidence than those used to establish a defendant's innocence or guilt."
In the Illinois case, the fMRI defense didn't help the defendant, whom a jury sentenced to death.