In addition to jury sentencing through the guidance of aggravating factors, a constitutional capital sentencing scheme must provide for appellate review of the death sentence, typically by the state's supreme court. This review must not be a rubber stamp; there must be evidence in the state's decisional law that the court takes seriously its responsibility to ensure that the sentence imposed was not arbitrary. Currently, those states which still maintain a death penalty option have a mandatory appeal of the sentence (defendants sentenced to death cannot waive this appeal, but can waive appeals beyond this stage subject to a competency hearing).