The death penalty isn't the problem here. We arguably still have an innocent person wasting away in prison, which is hardly much better than death.
The problem is a judicial review system that's extremely hesitant to consider exculpatory evidence following a conviction... and here we have an edge case where the conviction was gained by discredited scientific means. Science adapts quickly to new evidence and new methods, and quickly discards old ones; the courts don't work that way.
The problem is a judicial review system that's extremely hesitant to consider exculpatory evidence following a conviction... and here we have an edge case where the conviction was gained by discredited scientific means. Science adapts quickly to new evidence and new methods, and quickly discards old ones; the courts don't work that way.