(a) The Supreme Court of Georgia shall establish, by rules, a new unified review procedure to provide for the presentation to the sentencing court and to the Supreme Court of all possible challenges to the trial, conviction, sentence, and detention of defendants upon whom the sentence of death has been or may be imposed, which challenges before July 1, 1988, have been presented for review by the former unified review procedure under this subsection. Such new unified review procedure shall govern both pretrial and posttrial appellate review of death penalty cases.

(b) The Supreme Court shall establish, by rules, a series of check lists to be utilized by the trial court, the prosecuting attorney, and defense counsel prior to, during, and after the trial of cases in which the death penalty is sought to make certain that all possible matters which could be raised in defense have been considered by the defendant and defense counsel and either asserted in a timely and correct manner or waived in accordance with applicable legal requirements, so that, for purposes of any pretrial review and the trial and posttrial review, the record and transcript of proceedings will be complete for a review by the sentencing court and the Supreme Court of all possible challenges to the trial, conviction, sentence, and detention of the defendant.

(c) Nothing in this Code section or in the rules of the Supreme Court shall limit or restrict the grounds of review or suspend the rights or remedies available through the procedures governing the writ of habeas corpus.

(d) The procedures governing the writ of habeas corpus may be employed to assert rights or seek remedies if the procedures established in the rules of the Supreme Court as applied to the petitioner are inadequate or ineffective in any constitutional sense.