Twelve people, only one possible verdict. But one of them would not budge.

In the trial against Lindsay Clancy, the Massachusetts mother accused of killing her three children, the jury was made up of 9 women and 3 men. Eleven of them reached common ground: they believed there were sufficient grounds to find her not guilty by reason of insanity. Only one resisted until the end.

Roni Carlson, the jury foreperson, said that man admitted having reasonable doubts, but nevertheless refused to vote for acquittal. The other female jurors did not hide their frustration: they said he did not listen to them and clung to a single idea—that Lindsay had brutally killed her children, unable to process the rest of the evidence.

The consequence was inevitable. Without unanimity, the judge declared a mistrial. And the question that lingers is whether eleven convinced people are enough to speak of justice, or whether the weight of a single doubt is worth exactly as much as that of all the others combined.

