Does a defendant's release from prison prior to the completion of his federal habeas corpus proceedings render his petition moot?

2 Prantil was released from prison on April 20, 1987. However, because a felony conviction may cause a defendant to suffer adverse collateral consequences even after he has served his sentence, a defendant's release from custody prior to the completion of his federal habeas corpus proceedings will not render his petition moot. Carafas v. LaVallee, 391 U.S. 234, 237-38, 88 S.Ct. 1556, 1559, 20 L.Ed.2d 554 (1968). Prantil was in custody when he filed the petition in district court, so this court retains jurisdiction over the proceedings after he is released. Id.