The State is seeking the death penalty against Timothy Carl Dawson, who has been charged with four murders and numerous other crimes in Fulton County, and against Carzell Moore, in his new sentencing trial following his conviction for the 1976 murder and rape of Teresa Allen in Monroe County. See Moore v. State, 240 Ga. 807 (243 SE2d 1) (1978). Challenges were raised in both cases to the State’s use of electrocution as the method of executing persons sentenced to death for capital offenses in Georgia. The trial court in Dawson’s case found that the use of electrocution violates the State and Federal Constitutions; the trial court in Moore’s case upheld the constitutionality of the use of electrocution. This Court granted Dawson and Moore’s applications for interim review, consolidated the cases, and directed the parties to address whether electrocution *328remains a constitutional method of execution in Georgia. Upon considered review of this difficult issue, we conclude that future use of electrocution as a means of executing death sentences in Georgia would violate the prohibition against cruel and unusual punishment in Art. I, Sec. I, Par. XVII of the Georgia Constitution. Therefore, we direct that any future executions of death sentences in Georgia be carried out by lethal injection in accordance with OCGA § 17-10-38, as amended.
1. Both the Georgia Constitution and the Constitution of the United States proscribe punishments that are “cruel and unusual.” U. S. Const., Amend. VIII; Ga. Const, of 1983, Art. I, Sec. I, Par. XVII. Long before the Eighth Amendment to the United States Constitution came to be recognized as fully applicable, through the Fourteenth Amendment, to states’ powers to punish their own citizens, see Robinson v. California, 370 U. S. 660, 667 (82 SC 1417, 8 LE2d 758) (1962), Georgia constitutional law proscribed this State’s use of cruel and unusual punishments. Ga. Const. 1861, Art. I, Sec. 4901. Thus, while this Court consults decisions interpreting the Eighth Amendment to the Federal Constitution and must give full effect to that Amendment, this Court has recognized that “Federal constitutional standards represent the minimum, not the maximum, protection that this state must afford its citizens [cit.],” Fleming v. Zant, 259 Ga. 687, 690 (3) (386 SE2d 339) (1989), and we have explicitly held that in interpreting the prohibition against cruel and unusual punishment found in the Georgia Constitution, the applicable standard is “the standard of the people of Georgia, not the national standard.” Id.
2. The people of Georgia, through their elected representatives, have chosen electrocution as the method of executing persons sentenced to death for capital offenses committed before May 1, 2000. Ga. L. 2000, p. 947, § 1. See OCGA § 17-10-38. We operate from the presumption that this method of execution is constitutional. See Miller v. State, 266 Ga. 850 (2) (472 SE2d 74) (1996) (statutes are presumed constitutional). That presumption of constitutionality, however, cannot prevail when a statute manifestly infringes upon a constitutional provision or violates the rights of the people. Id. Thus, the mere fact that the Legislature has spoken on the issue of the method of execution does not preclude or in any manner limit this Court’s evaluation of the selected method to determine whether it comports with the constitutional prohibition against cruel and unusual punishment. See Lambeth v. State, 257 Ga. 15, 16 (354 SE2d 144) (1987). See also Weems v. United States, 217 U. S. 349, 379 (30 SC 544, 54 LE 793) (1910) (legislatively-prescribed punishments “have no limitation . . . but constitutional ones, and what those are the judiciary must judge”).
*329Similarly, prior rulings by this Court regarding the constitutionality of the use of electrocution cannot be deemed determinative of the issue. This Court has acknowledged that “whether a particular punishment is cruel and unusual is not a static concept, but instead changes in recognition of the ‘ “evolving standards of decency that mark the progress of a maturing society.” ’ [Cit.]” Fleming v. Zant, supra, 259 Ga. at 689 (1). As noted by the United States Supreme Court in addressing the scope of the Eighth Amendment’s prohibition against cruel and unusual punishments, “if we are to attribute an intelligent providence to its advocates we cannot think that it was intended to prohibit only practices like the Stuarts, or to prevent only an exact repetition of history.” Weems v. United States, supra, 217 U. S. at 373.
Time works changes, brings into existence new conditions and purposes. Therefore a principle to be vital must be capable of wider application than the mischief which gave it birth. This is peculiarly true of constitutions. They are not ephemeral enactments, designed to meet passing occasions. They are, to use the words of Chief Justice Marshall, “designed to approach immortality as nearly as human institutions can approach it.” The future is their care, and provision for events of good and bad tendencies of which no prophecy can be made. In the application of a constitution, therefore, our contemplation cannot be only of what has been but of what may be.
Id.
In OCGA § 17-10-38, as amended, the Legislature also contemplated “what may be,” id., when it recognized the possibility that this Court would find unconstitutional its retention of electrocution as the method of executing persons sentenced to death for capital offenses committed before that statute’s effective date. In anticipation of such a ruling and with full awareness of the disfavor into which death by electrocution has fallen,1 the Legislature made express provisions in the uncodified section of OCGA § 17-10-38. It specifically stated that
[i]t is the further intention of the General Assembly that persons sentenced to death for crimes committed prior to the *330effective date of this Act be executed by lethal injection if the Supreme Court of the United States declares that electrocution violates the Constitution of the United States or if the Supreme Court of Georgia declares that electrocution violates the Constitution of the United States or the Constitution of Georgia.
Ga. L. 2000, p. 947, § 1. See also id. at § 6, holding that lethal injection shall apply to persons sentenced to death for crimes committed prior to May 1, 2000 in the event electrocution is declared unconstitutional by this Court or the U. S. Supreme Court. Compare Ohio Rev. Code Ann. § 2949.22 (E) (providing in regard to the amendment allowing condemned prisoners to elect lethal injection that “[n]o change in the law made by this amendment constitutes a declaration by or belief of the general assembly that execution of a death sentence by electrocution is a cruel and unusual punishment proscribed by the Ohio Constitution or the United States Constitution”).
3. Our reevaluation of the constitutionality of electrocution as a method of execution in Georgia is influenced greatly by the enactment of the amended version of OCGA § 17-10-38. That statute represents “the clearest and most objective evidence of how contemporary society views a particular punishment” inasmuch as that significant change in the law “amount [s] to evidence of the shifting or evolution of the societal consensus.” Fleming v. Zant, supra, 259 Ga. at 689-690 (3). We note that while several death penalty cases have come before this Court since this significant change in the law, those cases have failed to offer the Court an opportunity to consider the question of the continued constitutionality of electrocution on the footing presented by the case before us now. Several recent cases challenging electrocution involved motions which were unsupported by admissible evidence or which proffered evidence that was not actually made part of the record placed before this Court. See, e.g., Colwell v. State, 273 Ga. 634, 640 (6) (544 SE2d 120) (2001) (“[i]n the absence of admissible evidence demanding a different result, the trial court did not err in declining to declare execution by electrocution unconstitutional”); Esposito v. State, 273 Ga. 183 (3) (b) (538 SE2d 55) (2000). But see Heidler v. State, 273 Ga. 54 (25) (537 SE2d 44) (2000) (declining to reverse where the trial court denied a request for an evidentiary hearing prior to April 27, 2000). In many of the recent cases, however, the issue of electrocution was not raised on appeal, had been waived at trial, or was procedurally barred. See Presnell v. State, 274 Ga. 246 (551 SE2d 723) (2001); Fults v. State, 274 Ga. 82 (548 SE2d 315) (2001) (issue not raised); Butts v. State, 273 Ga. 760 (31) (546 SE2d 472) (2001); Head v. Carr, 273 Ga. 613 (2) (544 SE2d 409) (2001); Davis v. Turpin, 273 Ga. 244 (1) (539 SE2d *331129) (2000); Jones v. State, 273 Ga. 231 (539 SE2d 154) (2000). In contrast to those earlier cases, the consolidated appeals in this case involve evidence which was both admitted by the two trial courts and considered by those courts in light of the recent legislative changes in Georgia’s death penalty laws. Accordingly, we consider the issue to be properly before this Court and ready for review.
4. (a) The trial court in Moore’s case had before it testimony from defense experts, State experts, electrocution survivors, and prison officials, as well as autopsy reports prepared by the State after Georgia executions, audiotapes archiving Georgia executions, postmortem photographs of persons executed in Georgia, and Georgia protocols for execution by electrocution and by lethal injection. A defense expert testified that there is a possibility, even a likelihood, that Georgia’s electric chair does not produce instantaneous unconsciousness. He asserted that although very high voltage is applied in the first two portions of the three-stage, two-minute electrocution process, the brain is shielded from much of the electricity by the skull. The defense expert further claimed that the alternating current used in electrocutions could repetitively activate the brain, causing the perception of excruciating pain and a sense of extreme horror. Another defense expert testified that the two high-voltage portions of the electrocution process, which last a total of eleven seconds, would induce cardiac standstill but that the third, low-voltage portion of the electrocution process, which lasts 109 seconds, might fail to produce its designed effect of inducing ventricular fibrillation in half of all executions.
In two instances documented by prison officials as a record of Georgia executions, a second two-minute cycle of electricity was required due to life signs exhibited by the prisoner. In one case, breathing was observed during the five-minute “cooling off” period following the initial two-minute application of electricity, thus requiring the application of another two-minute cycle of electricity. In another case, the prisoner was observed bobbing his head from side to side during both the low-voltage portion of the first two-minute electrocution cycle and the five-minute lapse period that followed.2 The physicians who examined the prisoner during the first five-minute lapse period determined that he was still breathing. Although the prisoner stopped moving his head when the second cycle of electricity was initiated, the head movements resumed and he appeared to be breathing during both the final portion of the second electrocution cycle and during the first two minutes of the second *332cooling-off period.
The autopsy reports and autopsy photographs prepared as part of the State’s execution protocol establish that some degree of burning of the prisoner’s body is present in every electrocution.3 The autopsy reports contain repeated comments to the effect that the burns found on the deceased prisoners are “characteristic” or “typical” of injuries observed in previous executions, and there are references to blisters and burn marks observed on other places on the bodies. The autopsies also reference the sloughing or “slippage” of a large portion of the scalp and the skin at the back of the head and also on the legs caused by the execution.
The State presented expert testimony suggesting that Georgia’s electrocution protocol results in immediate unconsciousness upon the initial application of electricity and that this unconsciousness continues throughout the execution process. Two of the State’s experts testified that, while cardiac functioning is affected by the electricity, the primary mechanism of death in Georgia executions by electrocution is the “denaturing” or cooking of the brain from the heat created by the passing of electricity through the electrical resistance of the brain tissue.4 One expert testified about post-execution tests which showed that the brain reached temperatures between 135 to 145 degrees Fahrenheit. The other expert acknowledged that a person might retain sufficient functioning in the deepest part of the brain that controls basic life functions to continue some breathing or agonal gasps after the two-minute cycle of electricity has ended. The State adduced testimony from a victim of a lightning strike and a victim of an accidental electrocution that suggested those non-lethal electrocutions had been painless at the moment they occurred. The State also presented testimony from witnesses to several Georgia executions who saw prisoners during electrocutions clenching fists, tightening muscles, and straining involuntarily against the restraints. No evidence was presented which indicated that a Georgia execution has yet involved the sparks, flames, and smoke that have plagued executions by electrocution outside of Georgia. See Jones v. Butterworth, 701 So.2d 76, 86-87 (II) (Fla. 1997) (Shaw, J., dissenting); Buenoano v. State, 565 So.2d 309, 310-311, 314 (Fla. 1990) (per curiam).
The trial court in Moore’s case, confronted with conflicting *333expert testimony, was unable to conclude whether or not execution by electrocution inflicts conscious suffering. It found instead that “[a]ll the evidence is subject to conjecture and speculation.”
(b) The trial court in Dawson’s case agreed to consider transcripts, depositions, affidavits, and documentary materials copied from other cases in Georgia wherein challenges to electrocution had been raised. The court also considered audiotapes archiving Georgia executions. The State declined the trial court’s invitation to present evidence in Dawson’s case, relying, instead, solely upon this Court’s previous decisions on the constitutionality of execution by electrocution. Based on the evidence before it, the trial court found that electrocution involves lingering death, bodily mutilation and physical violence indicative of inhumanity and barbarity. After the court had issued its ruling on electrocution, the State raised a number of objections to the materials considered by the trial court and sought to introduce its own evidence. The State raises similar objections before this Court in this interim review. However, we do not reach those objections because, in this Court’s view, the materials in the Dawson record are merely cumulative to the evidence and testimony in Moore’s case upon which this Court more directly relies.
5. The United States Supreme Court has recognized that punishment is cruel and unusual when it unnecessarily involves “something more than the mere'extinguishment of life.” In re Kemmler, 136 U. S. 436, 447 (10 SC 930, 34 LE 519) (1890). “The traditional humanity of modern Anglo-American law forbids the infliction of unnecessary pain in the execution of the death sentence.” Louisiana ex rel. Francis v. Resweber, 329 U. S. 459, 463 (67 SC 374, 91 LE 422) (1947) (plurality opinion). This Court relied upon the Federal standard for examining a punishment when addressing a challenge under the Georgia Constitution in Fleming v. Zant, supra, 259 Ga. at 689 (3). We held therein that a punishment is cruel and unusual if it “makes no measurable contribution to accepted goals of punishment and hence is nothing more than the purposeless and needless imposition of pain and suffering.” (Citations and punctuation omitted.) Id.
Based on the findings made in these consolidated cases and giving greater weight to the Moore court because it found in favor of the constitutionality of death by electrocution, the evidence establishes that it is not possible to determine conclusively whether unnecessary pain is inflicted in the execution of the death sentence. The absence of a conclusive finding of conscious pain does not conclude our review, however, since under Georgia’s standard our focus is not limited to the issue of the unnecessary conscious pain suffered by the condemned prisoner. Compare Fierro v. Gomez, 77 F3d 301 (B) (2) (9th Cir. 1996), vacated on other grounds, Gomez v. Fierro, 519 U. S. 918 (117 SC 285, 136 LE2d 204) (1996); Campbell v. Wood, 18 F3d 662, *334681 (VII) (B) (1) (9th Cir. 1994). Such a limited focus would lead to the abhorrent situation where a condemned prisoner could be burned at the stake or crucified as long as he or she were rendered incapable by medication of consciously experiencing the pain, even though such punishments have long been recognized as “manifestly cruel and unusual.” In re Kemmler, supra, 136 U. S. at 446.
We cannot ignore the cruelty inherent in punishments that unnecessarily mutilate or disfigure the condemned prisoner’s body or the unusualness that mutilation creates in light of viable alternatives which minimize or eliminate the pain and/or mutilation. Although the Fourth Circuit Court of Appeals has posited that the “existence and adoption of more humane methods [of execution] does not automatically render a contested method cruel and unusual,” (emphasis supplied), Hunt v. Nuth, 57 F3d 1327, 1338 (4th Cir. 1995), the fact that a method involving less pain and mutilation exists and that many states have moved to that method because it is perceived to be a more humane manner of execution, id. at 1338 fn. 16, clearly must play an important factor in the determination whether an older method is cruel and unusual punishment. Comparison with existing methods is thus required to determine whether or not a punishment involves the “unnecessary cruelty’ forbidden by both the Eighth Amendment, In re Kemmler, supra, 136 U. S. at 447, and the Georgia Constitution, since it is not possible to determine whether a punishment has been “reduced, as nearly as possible, to no more than that of death itself,” (emphasis supplied), Louisiana ex rel. Francis v. Resweber, supra, 329 U. S. at 474 (Burton, J., dissenting), without comparing the punishment to other available methods to ascertain what currently is possible.
The evidence adduced in the record in Moore reveals uncon-trovertedly that the bodies of condemned prisoners in Georgia are mutilated during the electrocution process.5 This applies whether or not the electrocution protocols are correctly followed and the electrocution equipment functions properly. The autopsy reports show that the bodies are burned and blistered with frequent skin slippage from the process, and the State’s experts concur that the brains of the condemned prisoners are destroyed in a process that cooks them at temperatures between 135 and 145 degrees Fahrenheit. This evidence, gathered by the State’s own agents or acknowledged by the State’s own experts, establishes the mutilating effects of electrocution. This is in contrast with evidence before the Moore trial court regarding *335death by lethal injection6 which was shown to involve a minimally intrusive procedure which does not produce the mutilation which is a necessary by-product of death by electrocution.
Based on this evidence of the electrocution process and comparing that process with lethal injection, a method of execution the Legislature has now made available in this State, we conclude that death by electrocution involves more than the “mere extinguishment of life,” In re Kemmler, supra, 136 U. S. at 447, and inflicts purposeless physical violence and needless mutilation that makes no measurable contribution to accepted goals of punishment. Fleming v. Zant, supra, 259 Ga. at 689 (3). Accordingly, we hold that death by electrocution, with its specter of excruciating pain and its certainty of cooked brains and blistered bodies, violates the prohibition against cruel and unusual punishment in Art. I, Sec. I, Par. XVII of the Georgia Constitution.
While cognizant of Justice Frankfurter’s admonition that judges must “be on guard against finding in personal disapproval a reflection of more or less prevailing condemnation,” Louisiana ex rel. Francis v. Resweber, supra, 329 U. S. at 471 (Frankfurter, J., concurring), this Court’s determination that electrocution is a cruel and unusual method of punishment is founded securely upon clear and objective evidence in the form of our State Legislature’s action in totally abolishing electrocution as a method of extinguishing the life of those individuals condemned to death upon their conviction for capital offenses committed after May 1, 2000. The Legislature’s adoption of lethal injection as the exclusive method for executing the death penalty in Georgia reflects societal consensus that the “science of the present day” has provided a less painful, less barbarous means for taking the life of condemned prisoners. See In re Kemmler, supra, 136 U. S. at 444. This action by our State Legislature in totally abolishing electrocution as a future method of execution in this State constitutes the “clearest and most objective evidence” of a prevailing condemnation by the people of Georgia of that particular punishment. See Fleming v. Zant, supra, 259 Ga. at 689 (3).
6. Although we hold that the continued use of electrocution for executing death sentences in Georgia violates the Georgia Constitution, sentences of death which previously would have been executed by electrocution are not thereby rendered void. “Where one portion of a statute is unconstitutional, this court has the power to sever that portion of the statute and preserve the remainder if the remaining portion of the Act accomplishes the purpose the legislature intended. *336[Cits.]” Nixon v. State, 256 Ga. 261, 264 (3) (347 SE2d 592) (1986). The severability of the sentence of death from the method of execution of that sentence in Georgia law is apparent in the death penalty statutes as they appeared before their recent amendment and in the nature of their amendment. See OCGA § 17-10-30 et seq.; Ga. L. 2000, p. 947, § 1 et seq.; see also OCGA § 1-1-3. In fact, the portions of former OCGA § 17-10-30 et seq. which would otherwise have been stricken by this Court’s decision regarding electrocution have already been amended by the codified portions of the General Assembly’s recent legislation in a manner that is consistent with this decision. See Ga. L. 2000, p. 947, § 1 et seq. Therefore, only those uncodified portions of that recent legislation that retained the use of electrocution for the punishment of capital offenses committed before May 1, 2000, are hereby declared void. The remaining portions are to be given full effect, including those portions providing for the execution of all death sentences by lethal injection in the event, now realized, that electrocution is declared unconstitutional by this Court. Id. See also Rooney v. North Dakota, 196 U. S. 319, 325 (2) (25 SC 264, 49 LE 494) (1905) (“a statute which mitigates the rigor of the law in force at the time a crime was committed cannot be regarded as ex post facto with reference to that crime”); Fierro, supra, 77 F3d at 305 (A) (2) (“regardless of whether we conclude that the district court was correct in finding execution by lethal gas unconstitutional, plaintiffs’ sentences of death remain unaffected”).
Judgment affirmed in Case No. S01A1041. Judgment reversed in Case No. S01A1210.
All the Justices concur, except Carley, Thompson and Hines, JJ., who dissent.See Rebecca Brannan, Peach Sheet, Sentence and Punishment: Change Method of Executing Individuals Convicted of Capital Crimes from Electrocution to Lethal Injection, 17 Ga. St. L. Rev. 116 (2000). See also Esposito v. State, 273 Ga. 183 (3) (a) (538 SE2d 55) (2000).
A defense expert testified that because the human autonomic nervous system does not make the head bob irom side to side, this movement indicated it was carried out by a conscious individual.
The documents, produced in response to a defense subpoena, include the autopsy reports on 20 of the 23 men who have died by State-imposed electrocution in Georgia since the reinstatement of the death penalty. See Gregg v. Georgia, 428 U. S. 153 (96 SC 2909, 49 LE2d 859) (1976).
The State’s remaining expert gave testimony consistent with the other witnesses in that he explained that the brain is “destroyed” by the electrical current and that in the absence of a functioning brain, the other functions of the body would cease.
Although appellants rely in large part on evidence regarding executions in other jurisdictions, we do not find it necessary to address the relevancy of such evidence or the differences in protocols and equipment which may distinguish such evidence. Our holding is thus based solely upon evidence derived from Georgia executions.
That evidence included not only the State’s lethal injection protocol but also testimony given by a defense witness at a November 1995 hearing, which was expressly incorporated by the defense into the evidence at the March 2001 hearing.