OPINION ON THE STATE’S PETITIONS FOR DISCRETIONARY REVIEW
MANSFIELD, Judge,delivered the opinion of the Court,
in which McCORMICK, Presiding Judge, and KELLER, HOLLAND and WOMACK, Judges, join.We granted the State’s petitions for discretionary review in these two cases to reconsider our prior holdings that the State, as part of its burden of proof in a criminal prosecution, must always prove beyond a reasonable doubt that the prosecution is not limitations-barred, even if the defendant does not raise the issue.
The Relevant Facts
On January 29, 1982, five men, including appellants Aaron Dwayne Proctor and Jonathan L. Lemell, robbed Wing K. Lew, Yit Oi Lew (Wing’s wife), and Gloria Windom at gunpoint in the small grocery store that the Lews operated in Houston. In the course of the robbery, Proctor shot Mr. Lew in the head and killed him.
On July 29,1982, the Harris County Grand Jury indicted appellants for, among other things, the aggravated robbery of Mr. Lew by placing Ms. Lew in fear of imminent bodily injury or death. See Tex. Penal Code § 29.03. The two cases were consolidated for trial, and on November 29, 1982, a Harris County petit jury found appellants guilty of the aggravated robbery offense. The Fourteenth Court of Appeals reversed the convictions, however, because of error in the jury selection process. Proctor v. State, No. B14r-*84282-870-CR (Tex.App. — Houston [14th Dist.] 1985, pet. refd) (unpublished); Lemell v. State, No. A14-82-872-CR (Tex.App. — Houston [14th Dist.] 1985, pet. refd) (unpublished).
On January 8, 1988, almost six years after the date of the offense, the Harris County Grand Jury indicted appellants again, this time for, among other things, the aggravated robbery of Mr. Lew by causing serious bodily injury to him. See Tex. Penal Code § 29.03. The two eases were again consolidated for trial, and on April 29, 1988, a second Harris County petit jury found appellants guilty of that aggravated robbery offense. During the jury’s deliberations at the punishment stage, however, appellants moved for an instructed verdict of acquittal on the ground that the State had failed to prove beyond a reasonable doubt that the prosecution was not limitations-barred.1 At a hearing on appellants’ motions, the State conceded that it had presented no evidence before the jury regarding limitations, but it proffered evidence to the trial court that the statute of limitations for the offense in question had been tolled. At the conclusion of the hearing, the trial court denied appellants’ motions. The jury subsequently assessed Proctor’s punishment at imprisonment for life and Lemell’s punishment at imprisonment for 65 years and a $5,000 fine. The Eleventh Court of Appeals2 reversed the convictions, though, on the ground they were jeopardy-barred. Proctor v. State, 806 S.W.2d 252 (Tex.App. — Eastland 1990); Lemell v. State, No. 11-88-150-CR (Tex.App. — Eastland 1990) (unpublished).
We granted the State’s petitions for discretionary review, reversed the judgments of the court of appeals, and remanded the cases to that court so that it could consider appellants’ remaining points of error. Proctor and Lemell v. State, 841 S.W.2d 1 (Tex.Crim.App.1992). On remand, the court of appeals affirmed appellants’ convictions, holding, among other things, that appellants could not complain of the State’s failure to prove that the prosecution had not been limitations-barred because appellants themselves had failed to timely object to any limitations defect in the indictments. Proctor v. State, 871 S.W.2d 225 (Tex.App. — Eastland 1993); Lemell v. State, No. 11-88-150-CR (Tex.App.-Eastland 1993) (unpublished).
We then granted appellants’ petitions for discretionary review and reversed the judgments of the court of appeals a second time. Proctor v. State, 915 S.W.2d 490 (Tex.Crim.App.1995); Lemell v. State, 915 S.W.2d 486 (Tex.Crim.App.1995). In our opinions we explained that what appellants had raised on appeal were not indictment defects but rather evidentiary insufficiency claims, and that no objections at trial were necessary to preserve such claims. We cited with approval the line of cases in which we have held that (1) in a criminal prosecution, the State must always prove beyond a reasonable doubt that the prosecution is not limitations-barred, even if the defendant does not raise the issue, and (2) if the State fails to carry its burden, the defendant is entitled to an acquittal. See, e.g., Van Hoang v. State, 939 S.W.2d 593, 596-597 (Tex.Crim.App.1996); Ex parte Matthews 933 S.W.2d 134, 136 (Tex.Crim.App.1996); State v. Turner, 898 S.W.2d 303, 307-308 (Tex.Crim.App.1995); Barnes v. State, 824 S.W.2d 560, 562 (Tex.Crim.App.1992); Vazquez v. State, 557 S.W.2d 779, 783 n. 5 (Tex.Crim.App.1977); Scott v. State, 534 S.W.2d 711, 712 (Tex.Crim.App.1976); Cooper v. State, 527 S.W.2d 563, 565 (Tex.Crim.App.1975); Donald v. State, 165 Tex.Crim. 252, 306 S.W.2d 360, 362 (1957). We then remanded the cases to the court of appeals so that that court could determine, in the first instance, whether the evidence at trial was sufficient to prove that the prosecution had not been limitations-barred. On the second remand, the court of appeals answered that question in the negative, reversed appellants’ convictions a second time, and ordered acquittals. Proctor v. State, No. 11-88-149-CR (Tex.App. — Eastland 1996) (unpublished); Lemell v. State, No. 11-88-150-CR *843(Tex.App. — Eastland 1996) (unpublished). We subsequently granted the State’s petitions for discretionary review to reconsider our holdings that the State must always prove beyond a reasonable doubt that its prosecution is not limitations-barred. See Tex.R.App. Proc. 66.3(b).
The State argues now that limitations is essentially a defensive issue and that it should have the burden of proving beyond a reasonable doubt that a prosecution is not limitations-barred only if there is some evidence before the jury that the prosecution is limitations-barred. The State argues, in effect, that we should overrule precedent and treat limitations as a defense. See Proctor v. State, 915 S.W.2d at 491 (McCormick, P.J., dissenting) (statute of limitations is a defense under Texas Penal Code § 2.03); Lemell v. State, 915 S.W.2d at 490 (McCormick, P.J., dissenting) (same). If we adopted the rule advanced by the State and applied it to appellants, then appellants could not prevail on their sufficiency claims, because there was no evidence before their jury that the prosecution was limitations-barred.
Appellants argue, in contrast, that it is settled law that the State must always prove, as part of its burden of proof, that its prosecution is not limitations-barred. Appellants argue further that if we were to change that law now and apply that change retroactively to them, then “that would have the effect of depriving [them] of a defense” and would violate the ex post facto prohibition contained in the Due Process Clause of the Fourteenth Amendment to the United States Constitution.
Analysis
Generally speaking, the statute of limitations contained in Chapter 12 of the Texas Code of Criminal Procedure insulates individuals from criminal prosecution after the passage of an express period of time following the commission of an offense. Thus, the statute of limitations is an act of grace for the benefit of potential defendants, a voluntary surrendering by the people of their right to prosecute. Vasquez v. State, 557 S.W.2d at 781. This act of grace serves several objectives: (1) it protects defendants from having to defend themselves against charges when the basic facts may — or may not — have become obscured by time; (2) it prevents prosecution of those who have been law-abiding for some years; and (3) it lessens the possibility of blackmail. See W. LaFave & J. Israel, Criminal Procedure § 18.5(a) (2nd ed.1992). In short, the statute of limitations is a procedural rule, in the nature of a defense, that was enacted basically for the benefit of defendants and not the State.
As noted previously, we have held repeatedly that the State must always prove, as part of its burden of proof in a criminal prosecution, that the prosecution is not limitations-barred, even if the defendant does not raise the issue. Evidently, those holdings were intended to effectuate the statute of limitations. But “[t]his Court’s past pronouncements regarding limitations statutes have lacked consistency.” State v. Yount, 853 S.W.2d 6, 8 (Tex.Crim.App.1993). In at least two cases we have referred to limitations as a matter of defense to be raised by the defendant, thus implying that the statute of limitations creates a right that is forfeited by inaction on the part of the defendant. See Ex parte Schmidt, 500 S.W.2d 144, 146 (Tex.Crim.App.1973); Ex parte Ward, 470 S.W.2d 684, 686 (Tex.Crim.App.1971). And in State v. Yount, we held, in effect, that a defendant may waive his limitations defense with respect to a lesser included offense by requesting a jury instruction on that offense.
In Marin v. State, 851 S.W.2d 275 (Tex.Crim.App.1993), we explained that our system of adjudication contains three distinct kinds of rules (or “rights”). In the first category are absolute, systemic requirements and prohibitions, which are “essentially independent of the litigants’ wishes.” Id. at 279. In the second category are rules which must be implemented unless expressly waived. This second category is generally restricted to rules which are “fundamental to the proper functioning of our adjudicatory system.” Id. at 278. In the third category are rules which must be implemented upon request. This third category contains most of “the myriad evidentiary and procedural rules comprising our system.” Ibid.
*844In which category is the statute of limitations? By requiring the State to prove, in every criminal prosecution, that the prosecution is not limitations-barred, most of our relevant precedents have placed the statute of limitations in the first category. That is, under our precedents, the statute of limitations is a rule “essentially independent of the litigants’ wishes.” For two reasons, though, we now conclude that placing limitations in that category is inappropriate.
First, we can see no purpose in treating limitations as an absolute, systemic requirement or prohibition. For one thing, the statute of limitations has little to do with the truth-finding function of the criminal justice system. It seems to us that a defendant, having been given the statute of limitations as a defense, ought to have the burden of asserting that defense or losing it, just as he would any other defense. Accord, United States v. Walsh, 700 F.2d 846, 856 (2d Cir.), cert. denied, 464 U.S. 825, 104 S.Ct. 96, 78 L.Ed.2d 102 (1983); United States v. Karlin, 785 F.2d 90, 92-93 (3d Cir.1986), cert. denied, 480 U.S. 907, 107 S.Ct. 1351, 94 L.Ed.2d 522 (1987); United States v. Arky, 938 F.2d 579, 581-582 (5th Cir.1991), cert. denied, 503 U.S. 908, 112 S.Ct. 1268, 117 L.Ed.2d 496 (1992); United States v. Ross, 77 F.3d 1525, 1536 (7th Cir.1996); United States v. LeMaux, 994 F.2d 684 (9th Cir.1993); United States v. Gallup, 812 F.2d 1271, 1280 (10th Cir.1987); Com. v. Barrett, 418 Mass. 788, 641 N.E.2d 1302, 1306 (1994); Longhibler v. State, 832 S.W.2d 908, 911 (Mo.1992); Hubbard v. State, 112 Nev. 946, 920 P.2d 991, 993 (1996); C. Wright, Federal Practice and Procedure: Criminal 2d § 193 (1982). We see no logic in requiring the State, in every case, to disprove a defense that the defendant may not bother to raise.
Second, treating limitations as an absolute, systemic requirement or prohibition may, on occasion, be unjust, because a defendant may have compelling reasons in his own best interest to forego the statute of limitations defense. For example, before the statute of limitations has run, a defendant might make a calculated decision to waive the defense when the statute is about to run in order to gain time for plea bargaining. Or a defendant might want to forego the limitations defense in order to vindicate his good name in the face of a serious and publicly known charge otherwise barred by limitations.3
We also conclude that placing limitations in the second Marin category is equally inappropriate. However important the statute of limitations might be to a defendant in a given ease, the statute can hardly be deemed “fundamental to the proper functioning of our adjudicatory system.” Indeed, at common law there was no limitation as to the time within which offenses could be prosecuted. Vasquez v. State, 557 S.W.2d at 781.
In short, we conclude, and hold, that the statute of limitations belongs in the third category of rules. The defense it creates is forfeited if not asserted at or before the guilt/innocence stage of trial. Before trial, a defendant may assert the statute of limitations defense by filing a motion to dismiss under Article 27.08(2) of the Texas Code of Criminal Procedure. At trial, the defendant may assert the defense by requesting a jury instruction on limitations if there is some evidence before the jury, from any source, that the prosecution is limitations-barred. If there is some such evidence and the defendant requests a jury instruction on the limitations defense, then the State must prove beyond a reasonable doubt that the prosecution is not limitations-barred. Compare Tex. Penal Code § 2.03. Finally, the defendant may, either before trial or at trial, waive the statute of limitations defense. This procedural scheme will serve adequately to effectuate the purposes of the statute of limitations, while bringing some clarity and simplicity to this area of the law. Anything in our prior decisions to the contrary is overruled.
We recognize that the doctrines of stare decisis and law of the case should generally be followed, because they promote judicial efficiency and consistency, they fos*845ter reliance on judicial decisions, and they contribute to the actual and perceived integrity of the judicial process. See McGlothlin v. State, 896 S.W.2d 183, 188 (Tex.Crim.App.), cert. denied, 516 U.S. 882, 116 S.Ct. 219, 133 L.Ed.2d 150 (1995); Wheatfall v. State, 882 S.W.2d 829, 843 (Tex.Crim.App.1994), cert. denied, 513 U.S. 1086, 115 S.Ct. 742, 130 L.Ed.2d 644 (1995); Ex parte Granger, 850 S.W.2d 513, 516 (Tex.Crim.App.1993). But when governing decisions of this Court are unworkable or badly reasoned, we are not constrained to follow precedent.4 See, e.g., Guzman v. State, 955 S.W.2d 85 (Tex.Crim.App.1997). If we were, the law would never develop.
Appellants’ reliance upon the ex post facto prohibition contained in the Due Process Clause of the Fourteenth Amendment is misplaced. The Ex Post Facto Clause of Article I, § 10, of the United States Constitution is a limitation upon the powers of state legislatures and not state courts. Marks v. United States, 430 U.S. 188, 190-91, 97 S.Ct. 990, 992, 51 L.Ed.2d 260 (1977). Still, the principle on which the Clause is based — that persons have, at the time they engage in conduct, a right to fair warning of what conduct will give rise to which criminal penalties — is fundamental to our concept of constitutional liberty and is, therefore, protected against judicial action by the Due Process Clause. Id., at 191-93, at 993. Thus, a state judicial decision may not operate retroactively if it has the effect of depriving persons of fair warning of what conduct will give rise to which criminal penalties. Ibid.Our decision today, however, even if applied to appellants, will not deprive them, retroactively, of fair warning of what conduct will give rise to which criminal penalties. Our decision does not retroactively alter the definition of aggravated robbery as it existed in 1982, its range of punishment, or the substantive defenses that were available with respect to it. See Collins v. Youngblood, 497 U.S. 37, 41-43, 110 S.Ct. 2715, 2719, 111 L.Ed.2d 30 (1990).
Appellants make no other constitutional or policy arguments regarding retroac-tivity, and, in the absence of briefing, we will consider no others.5
Conclusion
Since there was no limitations issue raised until the punishment stage of appellants’ trial, the State had no burden to prove beyond a reasonable doubt that the prosecution was not limitations-barred. Consequently, appellants’ evidentiary insufficiency claims must fail.
We REVERSE the judgments of the court of appeals and AFFIRM the judgments of the trial court.
OVERSTREET, J., delivered a dissenting opinion. MEYERS, J., delivered a dissenting opinion in which PRICE, J., joins. BAIRD, J., did not participate.. Articles 12.01(4)(A) and 12.03(d) of the Texas Code of Criminal Procedure provide that a prosecution for aggravated robbery must be commenced within five years of the commission of the offense.
. The Texas Supreme Court transferred the cases from the Fourteenth Court of Appeals to the Eleventh Court of Appeals. See Tex. Gov’t Code § 73.001.
. We are indebted to the Alaskan Supreme Court for these examples. See Padie v. State, 594 P.2d 50, 56 n. 16 (Alaska 1979).
. Judge Meyers, in dissent, complains that we are holding today that our prior rule regarding limitations has become "unworkable.” Judge Meyers is mistaken. What we are holding today is that the prior rule was badly reasoned.
. Judge Meyers, in dissent, complains that we are applying our new limitations rule to appellants retroactively. Judge Meyers is correct. We point out, however, that, as a general rule, judicial decisions are applied retroactively. It is, of course, within the Court's power to limit the retroactive effect of a decision, but we rarely do so, especially in the absence of briefing, because there is a need to reward the party (in this case, the State) responsible for convincing the Court to overrule unsound precedent.