Risk assessment tools are starting to take root in the criminal justice system. They’re used to make decisions about pretrial release, sentencing, and the level of supervision or custody to which a defendant will be subject. Some of the results are encouraging. For example, Mecklenburg County uses a risk assessment developed by the Laura and John Arnold Foundation to help make pretrial release decisions. The pretrial services office there reports that the risk assessment has contributed to “transformational change” in how pretrial justice is administered, with fewer secured bonds being imposed the jail population falling with no harm to public safety. Based in part on Mecklenburg’s success, the North Carolina Commission on the Administration of Law and Justice encouraged the creation of a pilot project that would “implement and assess more broadly . . . an empirically derived pretrial risk assessment tool.”