[at-fates-hands]

It's from the statistics of people on death row being exonerated for their crimes:

http://deathpenaltycurriculum.org/student/c/about/arguments/...

Since 1973, at least 121 people have been released from death row after evidence of their innocence emerged. During the same period of time, over 982 people have been executed. Thus, for every eight people executed, we have found one person on death row who never should have been convicted.