In most states, the decision of whether an inmate is paroled is vested in a paroling authority such as a parole board. Mere good conduct while incarcerated in and of itself does not necessarily guarantee that an inmate will be paroled. Other factors may enter into the decision to grant or deny parole, most commonly the establishment of a permanent residence and immediate, gainful employment or some other clearly visible means of self-support upon release (such as Social Security if the prisoner is old enough to qualify). Many states now permit sentences of life imprisonment without the possibility of parole (such as for murder and espionage), and any prisoner not sentenced to either this or the death penalty will eventually have the right to petition for release (one stateAlaskamaintains neither the death penalty nor life imprisonment without parole as sentencing options).