Increasingly arbitrary limits have been placed on use of the death penalty. One arbitrary prohibition established by the [[U.S. Supreme Court]] on use of the death penalty is when the murder is committed by someone under the age of 18.<ref>''See [[Roper v. Simmons]]''.</ref> Prior to this Supreme Court ruling, states had statutory minimum ages (at the time of crime) for when the death penalty could be imposed. | Increasingly arbitrary limits have been placed on use of the death penalty. One arbitrary prohibition established by the [[U.S. Supreme Court]] on use of the death penalty is when the murder is committed by someone under the age of 18.<ref>''See [[Roper v. Simmons]]''.</ref> Prior to this Supreme Court ruling, states had statutory minimum ages (at the time of crime) for when the death penalty could be imposed. |