Juries formed from all-white jury pools in Florida convicted black defendants 16 percent more often than white defendants, a gap that was nearly eliminated when at least one member of the jury pool was black, according to a Duke University-led study.

The study, “The Impact of Jury Race in Criminal Trials,” published Tuesday on the Quarterly Journal of Economics, focused on how conviction rates varied with the composition of the jury pool, which is randomly determined by which eligible residents are called for jury duty that day.

“I think this is the first strong and convincing evidence that the racial composition of the jury pool actually has a major effect on trial outcomes,” said senior author Patrick Bayer, chairman of Duke’s Economics Department.

Researchers examined more than 700 non-capital felony criminal cases in Sarasota and Lake counties from 2000-2010.

“Our Sixth Amendment right to a trial by a fair and impartial jury of our peers is a bedrock of the criminal justice system in the U.S., and yet, despite the importance of that right, there’s been very little systematic analysis of how the composition of juries actually affects trial outcomes, how the rules that we have in place for selecting juries impact those outcomes,” Bayer said.

Among the key findings: — In cases with no blacks in the jury pool, blacks were convicted 81 percent of the time, and whites were convicted 66 percent of the time. The estimated difference in conviction rates rises to 16 percent when the authors controlled for the age and gender of the jury and the year and county in which the trial took place.

— When the jury pool included at least one black person, the conviction rates were nearly identical: 71 percent for black defendants, 73 percent for whites.

— About 40 percent of the jury pools they examined had no black members and most of the others had one or two black members.

— When blacks were in the jury pool, they were slightly more likely to be seated on a jury than whites. The eligible jury population in these counties was less than 5 percent black.

“Simply put, the luck of the draw on the racial composition of the jury pool has a lot to do with whether someone is convicted and that raises obvious concerns about the fairness of our criminal justice system,” Bayer said.

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