| Appellants Ray Hobbs, in his official capacity as Director of the Arkansas Department of Correction, and the Arkansas Department of Correction (collectively the “ADC”) appeal the decision by the Pulaski County Circuit Court finding that Act 139 of 2013 unconstitutionally violates the separation-of-powers doctrine found in ar-tide IV of the Arkansas Constitution because it permits the ADC to select any chemical within a class of chemicals known as barbiturates to effectuate a sentence of death by lethal injection. Because this case involves substantial questions of law concerning the validity, construction, or interpretation of an act of the General Assembly, this court’s jurisdiction is proper pursuant to Arkansas Supreme Court Rule 1 — 2(b)(6). The circuit court ruled that Act 139 violates our 12separation-of-powers doctrine because it delegates to the ADC the “absolute discretion” to determine the type of barbiturate to use and sets no guidelines or standards concerning the competence of personnel who will carry out death sentences. We disagree, and hold that Act 139 is not an unconstitutional violation of the separation-of-powers clause found in this state’s constitution. We affirm the circuit court’s conclusion that Act 139 is not a sentencing statute and, therefore, does not violate our rules against retroactive application of sentencing statutes.
On April 26, 2013, the appellees (collectively “Prisoners”), all of whom are imprisoned within the ADC system and under sentences of death, filed a complaint for declaratory judgment and injunctive relief.1 The Prisoners asserted six claims in their complaint: (1) Applying Act 139 of *7102013 retroactively to their sentences violates the well-settled state-law principle that a sentence must bejn accordance with the statutes in effect on the date of the crime; (2) To the extent that it may be applied to them and implemented by the ADC, Act 139 violates the Ex Post Facto Clause of article 1, sections 9 and 10 of the United States Constitution because it creates a significant risk of increased punishment in the form of agony, degradation, serious injury, and/or lingering death as compared to Act 774 of 1983, which was in effect at the time of the Prisoners’ crimes; (3) Act 139 violates the separation-of-powers principles embodied in article IV of the Arkansas Constitution because it usurps legislative authority; (4) Act 139 violates the Eighth Amendment to the United States Constitution | obecause the ADC’s new lethal-injection procedure entails a substantial risk of wanton and unnecessary infliction of agony, degradation, serious physical injury, and/or lingering death; (5) Act 139 violates the Supremacy Clause of article IV, clause 2 of the United States Constitution and is preempted insofar as it purports to authorize the delivery, receipt, and use of Lorazepam and Phenobarbital; (6) Act 139 violates the separation-of-powers principle embodied in article IV of the Arkansas Constitution because it unlawfully delegates to the ADC standardless discretion with regard to the selection and training of the members of the execution team and with regard to the method by which the drugs are to be injected. A copy of the ADC’s lethal-injection protocol was attached to the complaint.
The Prisoners’ complaint specifically alleged that in its lethal-injection protocol the ADC selected Phenobarbital, a slow-acting barbiturate, to be used to effectuate death by lethal injection in Arkansas. According to the Prisoners, Act 139 permits the ADC to select from a wide range of drugs and, in exercising its discretion, the ADC selected two drugs, Lorazepam and Phenobarbital, despite the fact that the drugs are “a completely untried combination and quantity,” that “will take hours to be injected and to reach their peak effect, that will produce agonizing and degrading effects during the procedure, and that will severely injure and permanently injure— but may not kill — the Prisoners.” The Prisoners contended that the statute in effect at the time of their respective crimes required that the death penalty be carried out by “a continuous intravenous injection of a lethal quantity of an ultra-short acting barbiturate in combination with a chemical paralytic agent until the defendant’s death.” Act of Mar. 24, 1983, No. 774,1983 Ark. Acts 1804. The Prisoners also protested that Act |4139 contained no standard regarding the level of medical training for execution team members and did not provide for specific methods to be used for the injection. The Prisoners contended that Act 139 would permit the ADC to use anyone, medically trained or not, to serve on the execution team and would permit the use of outdated and painful procedures, such as “venous cut downs,” to gain access to a vein to administer lethal injections.2
During the course of the litigation, the ADC withdrew its lethal-injection protocol that specified the use of Phenobarbital and Lorazepam. Consequently, on June 14, 2013, the Prisoners amended their complaint to include only two facial challenges and abandoned their as-applied challenges. *711In their amended complaint the Prisoners alleged that (1) Anti-retroactivity principles require a declaration that the Prisoners may not be executed under Act 139, and; (2) Act 139 violates the separation-of-powers doctrine found in the Arkansas Constitution. On June 3, 2013, the ADC responded to the Prisoners’ complaint, asserting that Act 139 “constrains ADC’s discretion in selecting the lethal drug by requiring the Director to select a ‘barbiturate.’ ” The ADC admitted that Act 139 does not “codify criteria for selection or training of personnel involved with lethal injection,” and “does not codify how the ADC should obtain intravenous access.” The ADC acknowledged that Act 139 “had not yet been enacted at the time [the Prisoners] were convicted and sentenced,” and that “ADC intends to follow Act 139” in carrying out the sentences of death for each Prisoner. RThe ADC also pleaded affirmative defenses of sovereign and qualified immunity and failure to state facts upon which relief could be granted.
On September 16, 2013, the Prisoners filed a motion for summary judgment, asserting that there were no genuine issues of material fact remaining and requesting that the circuit court “declare [Act 139] invalid as applied to the Prisoners and unconstitutional on its face, and permanently enjoin its use.” In support of their motion, the Prisoners attached the codified version of Act 139, prior versions of the same statute, and an affidavit by Jonathan Groner, M.D., describing the effects of three different classes of barbiturates, the effects of benzodiazepines, and stating that “no other state includes intravenous administration of a benzodiazepine as a part of its lethal injection procedure.” In addition, the Prisoners attached a second affidavit, from David Waisel, M.D., describing the effects of barbiturates and benzodiaze-pines.
The ADC filed a cross-motion for summary judgment on the same date. Attached to its motion were several documents, including: excerpts from the principal brief of the Prisoners in Hobbs v. Jones, 2012 Ark. 293, 412 S.W.3d 844; parts of the ADC’s lethal-injection protocol; Act 1296 of 2009; Act 139 of 2013; a survey of state and federal method-of-execution statutes; transcript excerpts from a November 30, 2010 hearing and an August 15, 2011 hearing conducted in Hobbs v. Jones; excerpts from the briefs filed in Arkansas Dep’t of Correction v. Williams, 2009 Ark. 523, 357 S.W.3d 867.
On February 21, 2014, the circuit court entered a memorandum opinion and order granting summary judgment in favor of the Prisoners on their claim that Act 139 violates the | Bseparation-of-powers doctrine found in the Arkansas Constitution, but denying summary judgment on their claim that Act 139 could not be applied retroactively. The circuit court stated that the “upshot of this decision is that [the ADC is] enjoined to maintain the status quo and not proceed with executions under [Act 139 of 2013] until the statute is revised and no longer in violation of the separation of powers provision in the Constitution of Arkansas.” The circuit court found that “a change in the method of execution does not result in an increase in the quantum of punishment for capital murder, because the punishment, the option of death, remains the same.” The circuit court held that “[Act 139] is not a sentencing statute and that it will not be retroactively applied.” Regarding the separation-of-powers argument, the circuit court found that Act 139 ran afoul of this court’s opinion in Hobbs v. Jones, supra, because the Act vests the ADC with “absolute discretion” to determine the type of barbiturate to use and sets no guidelines or standards concerning the competence of personnel who *712will carry out death sentences. The circuit court further opined that “[t]he General Assembly has again abdicated its responsibility by passing to the executive branch the unfettered discretion to determine the chemicals to be used and the qualifications, competence, and standards to be followed for a state execution.” The court concluded that Act 139 delegated legislative authority “without giving sufficient guidelines for the use of that discretion, in clear violation of the doctrine of separation of powers set forth in our constitution,” and declared that Act 139 was “unconstitutional in its entirety.”
On March 21, 2014, the ADC filed a notice of appeal from the circuit court’s ruling that Act 139 violated the separation-of-powers doctrine. On March 28, 2014, the Prisoners |7filed a notice of cross-appeal from the circuit court’s ruling that Act 139 was not a sentencing statute and could be applied to them retroactively.
Typically, when faced with a challenge to the grant of a motion for summary judgment, this court examines the record to determine if genuine issues of material fact exist. McMullen v. McHughes Law Firm, 2015 Ark. 15, at 6, 454 S.W.3d 200. However, in a case where the parties agree on the facts, we simply determine whether the appellee was entitled to judgment as a matter of law. Bakalekos v. Furlow, 2011 Ark. 505, at 4, 410 S.W.3d 564, 568. When parties file cross-motions for summary judgment, as was done in this case, they essentially agree that there are no material facts remaining, and summary judgment is an appropriate means of resolving the case. Id. Matters of law are reviewed de novo. Nationwide Mut. Fire Ins. Co. v. Citizens Bank & Trust Co., 2014 Ark. 20, at 4, 431 S.W.3d 292, 294.
I. Direct Appeal
The ADC contends that the circuit court erred in ruling that Act 139 violates the separation-of-powers doctrine because it delegates to the ADC the authority to decide which drug, within a specific class of drugs, will be used for lethal injection. The Prisoners urge this court to affirm the circuit court’s conclusion because the drugs within the class of drugs designated by Act 139 vary greatly in effectiveness, side effects, and the time they take to act.
Acts of the legislature are presumed constitutional and the party challenging the statute has the burden to prove otherwise. Martin v. Kohls, 2014 Ark. 427, at 11, 444 S.W.3d 844, 850. If it is possible to construe a statute as constitutional, we must do so. Paschal v. State, 2012 Ark. 127, 388 S.W.3d 429. Because statutes are presumed to be framed in accordance |8with the Constitution, they should not be held invalid for repugnance thereto unless such conflict is clear and unmistakable. Id.
Our state constitution contains a specific separation-of-powers provision, which provides:
The powers of the government of the State of Arkansas shall be divided into three distinct departments, each of them to be confided to a separate body of magistracy, to-wit: Those which are legislative, to one, those which are executive, to another, and those which are judicial, to another.
No person or collection of persons, being of one of these departments, shall exercise any power belonging to either of the others, except in the instances hereinafter expressly directed or permitted.
Ark. Const. art. 4, §§ 1, 2. In Department of Human Services v. Howard, 367 Ark. 55, 238 S.W.3d 1 (2006), we explained the specific powers delegated to each branch. *713The legislative branch of the state government has the power and responsibility to proclaim the law through statutory enactments. Id. The judicial branch has the power and responsibility to interpret the legislative enactments. Id. The executive branch has the power and responsibility to enforce the laws as enacted and interpreted by the other two branches. Id. We acknowledge that the doctrine of separation of powers is a basic principle upon which our government is founded, and should not be violated or abridged. Id.
Although we have recognized that the legislature cannot delegate its power to proclaim the law to another branch of government, we have also recognized that it can delegate some discretionary authority to the other branches:
While it is a doctrine of universal application that the functions of the Legislature must be exercised by it alone and cannot be delegated, it is equally well settled that the Legislature may delegate to executive officers the power to determine certain facts, or 19the happening of a certain contingency, on which the operation of the statute is, by its terms, made to depend.
If the law is mandatory in all it requires and all it determines, it is a legislative act, although it is put into operation by officers or administrative boards selected by the Legislature.
State v. Davis, 178 Ark. 153, 156, 10 S.W.2d 513, 514 (1928); see also Ark. S. & L. Ass’n Bd. v. W. Helena S. & L., 260 Ark. 326, 538 S.W.2d 560 (1976) (noting that the legislature cannot delegate its lawmaking power but can delegate if the power is not purely legislative in nature). We have held that the true distinction is between the delegation of power to make the law, which necessarily involves the discretion as to what it shall be, and conferring authority or discretion as to its execution to be exercised under and in pursuance of the law. The first cannot be done. To the latter no valid objection can be made. Terrell v. Loomis, 218 Ark. 296, 300, 235 S.W.2d 961, 963 (1951).
Consequently, this court has recognized that such discretionary power may be delegated by the legislature to a state agency as long as reasonable guidelines are provided. Bakalekos v. Furlow, 2011 Ark. 505, 410 S.W.3d 564. This guidance must include appropriate standards by which the administrative body is to exercise this power. Id. A statute that, in effect; reposes an absolute, unregulated, and undefined discretion in an administrative agency bestows arbitrary powers and is an unlawful delegation of legislative powers. Id.
A review of the history surrounding Act 139 provides a helpful starting point in examining the separation-of-powers issue presented in this case. Approved on March 24, 1983, Act 774 of 1983 adopted lethal injection as the mode of execution in this state. Section 1 of Act 774 provided that “[t]he punishment of death is hereafter to bé administered by a | incontinuous intravenous injection of a lethal quantity of an ultra-short-acting barbiturate in combination with a chemical paralytic agent until the defendant’s death is pronounced according to accepted standards of medical practice.” Act of Mar. 24, 1983, No. 774, 1983 Ark. Acts 1804. Throughout their litigation, the Prisoners have maintained that Act 774 is constitutional because it specifies that the ADC must use a lethal quantity of an ultra-short-acting barbiturate in combination with a chemical paralytic agent and states that the drugs must be delivered by continuous intravenous injection until the condemned is dead. In 2009, the legislature adopted Act 1296. Known as the Methods of Execution Act *714(MEA), Act 1296 provided, in relevant part:
(1) The sentence of death is to be carried out by intravenous lethal injection of one (1) or more chemicals, as determined in kind and amount in the discretion of the Director of the Department of Correction.
(2) The chemical or chemicals injected may include one (1) or more of the following substances:
(A) One (1) or more ultra-short-acting barbiturates;
(B) One (1) or more chemical paralytic agents;
(C) Potassium chloride; or
(D) Any other chemical or chemicals, including but not limited to saline solution.
(3) The condemned convict’s death will be pronounced according to accepted standards of medical practice.
Methods of Execution Act, No. 1296, 2009 Ark. Acts 6214. In prior litigation, the Prisoners successfully challenged Act 1296 on the grounds that it violated the separation-of-powers doctrine embodied in our state constitution. Jones, 2012 Ark. 293, 412 S.W.3d 844. In Jones, this court held that the legislature has abdicated its responsibility and passed to the executive branch, via the ADC, the unfettered discretion to determine all protocol and procedures, including the chemicals to be used, for a state execution. We further held tha^jj the MEA failed to provide reasonable guidelines for the selection of chemicals to be used during lethal injection and it failed to provide any general policy with regard to the lethal-injection procedure. Id. at 15, 412 S.W.3d at 854.
Subsequently, the legislature adopted Act 139 of 2013. Act 139 provides:
(a)The Department of Correction shall carry out the sentence of death by intravenous lethal injection of a barbiturate in an amount sufficient to cause death.
(b) Before the intravenous lethal injection is administered, the condemned prisoner shall be intravenously administered a benzodiazepine.
(c) The drugs set forth in subsections (a) and (b) of this section shall be administered along with any substances that the manufacturer has mixed with the drugs and any additional substances, such as saline solution, called for in the manufacturer’s instructions.
(d) Catheters, sterile intravenous solution, and other equipment used for the intravenous injection of the drugs set forth in subsections (a) and (b) of this section shall be sterilized and prepared in a manner that is safe and commonly performed in connection with the intravenous administration of drugs of that type.
(e) The Director of the Department of Correction shall develop logistical procedures necessary to carry out the sentence of death, including:
(1) The following matters:
(A) Ensuring that the drugs and substances set forth in subsections (a) through (d) of this section and other necessary supplies for the lethal injection are available for use on the scheduled date of the execution;
(B) Conducting employee orientation of the lethal injection procedure before the day of the execution;
(C) Logistics of the viewing;
(D) Coordinating with other governmental agencies involved with security and law enforcement;
(E) Transferring the condemned prisoner to the facility where the *715sentence of death will be carried out;
(F) Escorting the condemned prisoner from the holding cell to the execution chamber;
(G) The identity, arrival, and departure of the persons involved with carrying out the sentence of death at the facility where the sentence of death will be carried out; and
(H) Making arrangements for the disposition of the condemned prisoner’s body and personal properly; and
(2) The following matters pertaining to other logistical issues:
(A) Chaplaincy services;
112(B) Visitation privileges;
(C) Determining the condemned prisoner’s death, which must be pronounced according to accepted medical standards;
(D) Confirming the type and concentration of the drugs and substances set forth in subsections (a) through (d) of this section when they have been received by the department; and
(E) Establishing a protocol for any necessary mixing or reconstitution of the drugs and substances set forth in subsections (a) through (d) of this section in accordance with the manufacturer’s instructions.
(f) The procedures for carrying out the sentence of death and related matters are not subject to the Arkansas Administrative Procedure Act, § 25-15-201 et seq.
(g) The procedures under subdivisions (e)(1) of this section and the implementation of the procedures under subdivisions (e)(1) of this section are not subject to disclosure under the Arkansas Freedom of Information Act of 1967, § 25-19-101 et seq.
(h) The department shall carry out the sentence of death by electrocution if this section is invalidated by a final and unappealable court order.
Act of Feb. 22, 2013, No. 139, 2013 Ark. Acts 557-59.3
According to the ADC, six attributes of Act 139 demonstrate that it complies with the separation of powers doctrine: (1) It provides a general policy with regard to the lethal | ^injection procedure; (2) It requires the sentence of death to be carried out by lethal injection rather than by other methods;4 (3) It mandates that the lethal *716injection be intravenous, as opposed to a direct cardiac infusion, intramuscular injection, or other injection procedure that does not involve injection into a vein; (4) It requires the ADC to carry out the procedure by using a barbiturate in an amount sufficient to cause death and limits the ADC’s discretion to selecting from a single class of drugs; (5) It mandates that, before the lethal dose of a barbiturate is injected, the ADC must intravenously administer a benzodiazepine,5 and; (6) It uses the terms “shall” and “must” six different times, including with regard to mandating that the ADC follow the manufacturer’s mixing instructions, sterilization of equipment, and the pronouncement of death.
The Prisoners urge this court to affirm the circuit court’s finding because they presented uncontested evidence that the term barbiturate applies to a “broad class of pharmaceutical agents with wide ranging properties and effects, including speed of onset and duration.” Thus, the Prisoners maintain that based on the delegation in Act 139, the ADC, at its sole discretion, could subject those sentenced to death by lethal injection to a death ranging from a few minutes to an hour or more. Additionally, the Prisoners take issue with the fact that Act 139 does not provide that “death should occur swiftly,” which they assert is a provision found in other jurisdictions’ lethal-injection statutes. The Prisoners further 114assert that this court’s opinion in Venhaus v. State ex rel Lofton, 285 Ark. 23, 684 S.W.2d 252 (1985), and Walden v. Hart, 243 Ark. 650, 420 S.W.2d 868 (1967), foreclose ADC’s argument that minimal guidance will suffice.
In Venhaus, this court held that a statute providing that the exact amounts of salaries of probation officers and deputy probation officers were to be set by a circuit judge vested unbridled discretion in the judge and contravened our separation-of-powers doctrine because the statute did not provide any guidance to be used in salary determination. Id. at 28, 684 S.W.2d at 255. The statute at issue in that case provided for a range of salary between $15,000 and $20,000, but did not provide for grades or steps based upon training, education, experience, or other fact or thing to be used in the salary determination. Id. According to the Prisoners, Venhaus stands for the proposition that the legislature may not delegate a range of options to an executive agency without also providing some criteria to guide the agency’s choice within the range. We disagree with the Prisoners’ broad characterization of our holding in Venhaus. Notably, in Venhaus, this court never stated that the legislature could not delegate the power to choose from among specific legislatively approved options. Instead, the statute at issue in that case failed to give any guidance on numerous factors and, therefore, provided a wide range of options to choose from and no criteria to guide that choice. In contrast, within Act 139 the legislature has provided that the ADC must select a barbiturate and must administer that barbiturate in an amount sufficient to cause death. While we acknowledge that more than one drug may meet this description, the fact remains that the legislature has provided criteria to guide the ADC’s exercise of discretion and has limited the |15ADC to selecting only from the legislatively approved options: a barbiturate in an amount sufficient to cause death.
*717Likewise, we find that Walden v. Hart, supra, is distinguishable from the present case. In Walden, we held that a provision of the then existing Uniform Motor Vehicle Code that defined emergency vehicle but then permitted the chief of police to authorize or designate certain ambulances as emergency vehicles was unconstitutional for delegating legislative powers. Like Venhaus, the issue in Walden was the complete absence of any guidelines from the legislature. The. statute did not provide any guidance regarding the necessary markings or exterior identification of a vehicle, such as lights, sirens, bells, or whistles, and it did not provide any guidance regarding the qualification or abilities of the driver of the vehicle. Walden, 243 Ark. at 654, 420 S.W.2d at 871. Thus, the statute gave to the named authorities an “unbridled discretion,” to consider any vehicle an emergency vehicle, which we determined was “fatal” under our separation-of-powers doctrine. Id. at 652, 420 S.W.2d at 870. However, we acknowledged that had the Legislature “afforded reasonable guidelines, we would have a different situation.” Id. Here, the legislature has afforded reasonable guidelines by limiting the ADC’s discretion to barbiturates, rather than permitting the ADC to consider any drug of any class.
Unlike Venhaus and Walden, where the statutes at issue contained no guidance or standards for the exercise of discretion, an examination of Act 139 reveals that it provides reasonable guidelines to the ADC in determining the method it will use to carry out the death penalty in Arkansas. Act 139 provides a general framework within which the ADC must |1fioperate and does not place absolute, unregulated and undefined discretion in the ADC. For instance, Act 139 requires intravenous lethal injection of a barbiturate in an amount sufficient to cause death. Thus, the legislature has provided guidance as to (1) the method the ADC must use, intravenous injection; (2) the type or class of drug the ADC must use, a barbiturate; and (3) the amount of the drug the ADC must use, an amount sufficient to cause death. Act 139 further requires that prior to administration of a barbiturate, the ADC must intravenously administer a benzodiazepine and that all drugs be administered per the manufacturer’s instructions. Further, Act 139 requires that all catheters, sterile intravenous solution, and other equipment used for the intravenous injection of the drugs set forth to be sterilized and prepared in a manner that is safe and commonly performed in connection with the intravenous administration of drugs of that type. Finally, Act 139 states the .General Assembly’s policy goal of providing “a means of carrying out the sentence of death while also complying with the constitutional prohibition on cruel and unusual punishment.” Act of Feb. 22, 2013, No. 139, 2013 Ark. Acts 555. These provisions provide reasonable guidance for the ADC’s exercise of its discretion.6 *718Moreover, by providing guidance on the method for [ 17carrying out the death penalty, the drags to be used, the order in which the drugs are to be administered, the amount to be administered, and the general policy for carrying out the death penalty in Arkansas, we find that Act 139 does not violate the separation-of-powers doctrine and is distinguishable from Act 1296, which we struck down in Jones.
The circuit court also held that Act 139 was unconstitutional because it does not specify the training and qualifications of the personnel involved with the lethal-injection procedure. In Baze v. Rees, 553 U.S. 35, 128 S.Ct. 1520, 170 L.Ed.2d 420 (2008), the Supreme Court of the United States upheld a Kentucky statute that did not specify the drugs or categories of drags to be used during an execution and did not provide any guidance on the training or qualifications of the personnel involved with the procedure. Like Arkansas, officials with the Kentucky Department of Corrections developed a lethal injection protocol describing the training and qualifications of personnel and the procedures to be followed in carrying out a sentence of death. In fact, the Kentucky statute prohibited physicians from participating in the “conduct of an execution,” except to certify the cause of death. Id. at 46, 128 S.Ct. 1520.
Moreover, our own constitution and precedents do not require the level of detail urged by the Prisoners in order for legislation to satisfy our separation-of-powers doctrine. In Hooker v. Parkin, 235 Ark. 218, 357 S.W.2d 534 (1962), this court rejected a separation-of-powers challenge to a statute that established the maximum salaries and wages for a maximum number of employees by grades and classes, but permitted the Highway Commission to employ a lesser number of employees and to pay less than the maximum salaries and wages to employees in the various grades and classes. Id. at 222, 357 S.W.2d at 538. This court noted that the delegation of this power was “necessary for the orderly and efficient operation of the Highway Department,” and that the “legislature has the right to delegate the power to determine facts upon which the law makes or intends to make its action depend.” Id. at 223, 357 S.W.2d at 538. Thus, this court has rejected the Prisoners’ contention that an act can never delegate decisions regarding training and qualification of personnel to an agency.
II. Cross-Appeal
The circuit court determined that Act 139 could be applied retroactively to the Prisoners, who were sentenced when Act 774 was in effect. The Prisoners contend that the circuit court erred because there is a presumption against applying sentencing laws retroactively. The ACD urges this court to affirm and relies heavily on this court’s opinion in Arkansas Department of Correction v. Williams, 2009 Ark. 523, 357 S.W.3d 867, in which this court rejected the argument that Act 1296 was a sentencing statute.
In Williams, Frank Williams, Jr., who was under a sentence of death, asserted *719that Act 1296 could not be applied to him because it was not expressly made retroactive by the General Assembly. Although we acknowledged the well-established rule that a sentence must be in accordance with the statutes in effect on the date of the crime, see State v. Ross, 344 Ark. 364, 39 S.W.3d 789 (2001), we rejected Williams’s characterization of Act 1296 as a 1 ^sentencing statute. Williams, 2009 Ark. 523, at 7, 357 S.W.3d at 871. We found that Act 1296 was not a sentencing statute and would not be applied “retroactively,” based on the following passage from Landgraf v. USI Film Products, 511 U.S. 244, 269-70, 114 S.Ct. 1483, 128 L.Ed.2d 229 (1994):
A statute does not operate “retrospectively” merely because it is applied in a case arising from conduct antedating the statute’s enactment ... or upsets expectations based in prior law. Rather, the court must ask whether the new provision attaches new legal consequences to events completed before its enactment. The conclusion that a particular rule operates “retroactively” comes at the end of a process of judgment concerning the nature and extent of the change in the law and the degree of connection between the operation of the new rule and a relevant past event.
Williams, 2009 Ark. 523, at 8, 357 S.W.3d at 871-72.
As in Williams, Act 139 does nothing to change the criminal liability or sentences for capital murder in Arkansas. Thus, there was no need for the General Assembly to state that Act 139 may be applied retroactively, because the Act will not be “retroactively” applied but will instead apply to all executions held after enactment. Id. at 9, 357 S.W.3d at 872.
We hold that Act 139 does not violate the separation-of-powers principle contained in article 4 of the Arkansas Constitution. - The delegation of authority contained within Act 139 is not unfettered and is bounded by reasonable guidelines from the legislature. Therefore we reverse the circuit court’s conclusion that Act 139 is unconstitutional. In addition, we hold that Act 139 is not a sentencing statute and, because it will be applied only to executions after its enactment, does not violate our rules against retroactive application of sentencing statutes. Therefore, we affirm the circuit court’s findings on this point.
Reversed on direct appeal; affirmed on cross-appeal.
Hannah, C.J., and Danielson and Wynne, JJ., concur in part and dissent in part.