With Oklahoma’s botched execution still a fresh memory, a bipartisan panel of criminal justice experts is recommending 39 steps to improve administration of the death penalty, including use of a deadly dose of a single anesthetic or barbiturate instead of the drug cocktail used in states that rely on lethal injection.

Calling its study one of the most comprehensive reviews ever done of the death penalty’s application, a committee of Washington-based The Constitution Project identified systemic flaws from arrest to execution and offered proposals to remedy them.