The execution of a US prisoner who didn’t kill anyone has raised questions about the death penalty

. . . According to Save Innocents, a group dedicated to highlighting possible death row miscarriages of justice, about 40 people have been put to death since the mid-1970s despite serious doubts about their guilt.

Meanwhile, a 2014 study by academics in Michigan and Pennsylvania found up to 4.1 per cent of prisoners sentenced to death since 1973 may well be innocent. If accurate, and some say it is closer to 2 per cent of cases, it could mean more that 300 people have either languished or perished on death row.

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