The Supreme Court’s divided decision this week allowing Missouri to execute a man for a 1998 murder even though his conviction was contested by prosecutors has heaped renewed scrutiny on the court’s approach to the death penalty.

In the aftermath of Williams’ execution there has been an outcry from the public due to the doubts over his conviction, especially since it was reported in August that a new development showed that the knife used in the murder was believed to have been contaminated by DNA from a prosecutor and investigator working on the case.