Alexander, J.
— We granted review of Ellsworth R. Robbins’ petition to review a decision of the Court of Appeals upholding the Okanogan County Superior Court’s affirmance of Robbins’ district court conviction on a charge of driving under the influence of alcohol (DUI). Robbins contends that the Court of Appeals erred in failing to recognize that in State v. Crediford, 130 Wn.2d 747, 927 P.2d 1129 (1996), this court “unanimously” declared that RCW 46.61.502(l)(a), the same statute under which he was charged in this case, was unconstitutional. He asserts, alternatively, that even if this court did not declare the statute unconstitutional in Crediford, we should either reconsider that decision and strike it down as violative of due process, or remand for a new trial because the trial court’s jury instructions relieved the State of its burden of proving the “implied element” we recognized in Crediford to the effect that there must be a nexus between the results [488]*488of a defendant’s blood alcohol test and the defendant’s blood alcohol level when actually driving. We affirm the Court of Appeals.
FACTS
Shortly before 3:00 a.m. on October 15, 1993, Deputy Rob Heyen, of the Okanogan Sheriffs Department, stopped a vehicle being driven by Ellsworth R. Robbins. Heyen did so because he believed that Robbins was exceeding the speed limit and had failed to signal a turn. Upon confronting Robbins, Heyen detected an odor of alcohol on Robbins’ breath. In response to questioning by Heyen, Robbins admitted that he had consumed alcohol prior to driving. Following Robbins’ failure to perform several field sobriety tests to Heyen’s satisfaction, the deputy arrested Robbins for DUI. Heyen then transported Robbins to the Okanogan County Jail where he administered two Breathalyzer tests to him. The first test was administered 58 minutes after Robbins was stopped, and the second test followed two minutes later. The tests registered at 0.13 and 0.12 grams of alcohol per 210 liters of breath respectively. Following administration of these tests, Heyen issued Robbins a ticket for DUI in violation of RCW 46.61.502.
Prior to trial at the Okanogan County District Court, Robbins moved to suppress the results of the Breathalyzer tests. At the hearing on his motion, Robbins claimed that before being stopped by Heyen, he had been at the home of a friend where he had consumed a glass of beer mixed with whiskey. Robbins said that after consuming the alcohol he went to his car and started to drive to his home, which was located three blocks away from his friend’s house. Robbins claimed that he had not felt the effects of the alcohol prior to being stopped by Heyen, but that he did feel the effects of it at the time the Breathalyzer tests were administered to him. The trial court denied Robbins’ motion to suppress.
At trial, Heyen testified that Robbins was in his custody and under his observation from the time Robbins was [489]*489stopped until Robbins performed the Breathalyzer tests and that during this time Heyen “did not observe any alcohol consumption by Mr. Robbins.” Clerk’s Papers (CP) at 217. Heyen said that 20 minutes before the first Breathalyzer test was administered Robbins conceded that “he had not consumed any alcohol since being stopped.” CP at 217. Robbins’ testimony at trial was consistent with the testimony he gave at the suppression hearing.
The trial court declined to give a jury instruction proposed by Robbins, which provided:
You may disregard the results of the test of the defendant’s breath if you entertain a reasonable doubt as to the accuracy of the test and the results thereof.
One of your duties in this case is to determine what weight or importance is to be given to the breath test result testified to in this case. In doing so, you may consider any evidence presented in this case that relates to whether or not the defendant was under the influence of alcohol.
In determining whether or not the breath test result was accurate you may consider the defendant’s testimony concerning the number of drinks he consumed and the effects of alcohol upon him, the testimony of witnesses concerning the number of drinks consumed by the defendant and the effects of the alcohol upon the defendant, and you may consider the testimony of any expert witness.
CP at 154. Instead, it instructed the jury as follows:
To convict the defendant of driving under the influence of intoxicating liquor, each of the following elements of the crime must be proved beyond a reasonable doubt:
(1) That on or about the 15th day of October, 1993, the defendant drove a a (sic) motor vehicle;
(2) (a) That the person had .10 grams of alcohol per two hundred ten liters of breath within two hours of driving; or
(b) While the person was under the influence of or affected by intoxicating liquor.
[490]*490(3) That the acts occurred in Okanogan County, Washington.
CP at 153.
The jury found Robbins guilty of DUI. Following sentencing, Robbins appealed his conviction to the Okanogan County Superior Court, which affirmed his conviction. Robbins then sought review in the Court of Appeals, Division Three. That court granted discretionary review and, following the issuance of our decision in Crediford, it affirmed Robbins’ conviction. Robbins then petitioned this court for review and we granted it.1 Robbins’ primary contention here, as it was below, is that we have held or should hold that RCW 46.61.502 is unconstitutional, and that we should, therefore, reverse his conviction and dismiss the DUI charge.
I
Robbins first contends that in Crediford this court unanimously declared RCW 46.61.502 to be unconstitutional on the basis that it exceeds the legitimate scope of the Legislature’s police power. Robbins overstates our holding in that case. In Crediford we simply concluded that subsection (3) of RCW 46.61.502, a provision which placed the burden on a defendant to prove an affirmative defense that his or her blood alcohol level was above the legal limit because of what he or she drank within two hours after driving, was unconstitutional.2 We went on to conclude, however, that the remainder of the statute passed constitu[491]*491tional muster.3 Crediford, 130 Wn.2d at 759-60 (“Our ruling that RCW 46.61.502(3) is constitutionally infirm does not, however, affect the remaining provisions of RCW 46.61.502.”).
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Alexander, J.
— We granted review of Ellsworth R. Robbins’ petition to review a decision of the Court of Appeals upholding the Okanogan County Superior Court’s affirmance of Robbins’ district court conviction on a charge of driving under the influence of alcohol (DUI). Robbins contends that the Court of Appeals erred in failing to recognize that in State v. Crediford, 130 Wn.2d 747, 927 P.2d 1129 (1996), this court “unanimously” declared that RCW 46.61.502(l)(a), the same statute under which he was charged in this case, was unconstitutional. He asserts, alternatively, that even if this court did not declare the statute unconstitutional in Crediford, we should either reconsider that decision and strike it down as violative of due process, or remand for a new trial because the trial court’s jury instructions relieved the State of its burden of proving the “implied element” we recognized in Crediford to the effect that there must be a nexus between the results [488]*488of a defendant’s blood alcohol test and the defendant’s blood alcohol level when actually driving. We affirm the Court of Appeals.
FACTS
Shortly before 3:00 a.m. on October 15, 1993, Deputy Rob Heyen, of the Okanogan Sheriffs Department, stopped a vehicle being driven by Ellsworth R. Robbins. Heyen did so because he believed that Robbins was exceeding the speed limit and had failed to signal a turn. Upon confronting Robbins, Heyen detected an odor of alcohol on Robbins’ breath. In response to questioning by Heyen, Robbins admitted that he had consumed alcohol prior to driving. Following Robbins’ failure to perform several field sobriety tests to Heyen’s satisfaction, the deputy arrested Robbins for DUI. Heyen then transported Robbins to the Okanogan County Jail where he administered two Breathalyzer tests to him. The first test was administered 58 minutes after Robbins was stopped, and the second test followed two minutes later. The tests registered at 0.13 and 0.12 grams of alcohol per 210 liters of breath respectively. Following administration of these tests, Heyen issued Robbins a ticket for DUI in violation of RCW 46.61.502.
Prior to trial at the Okanogan County District Court, Robbins moved to suppress the results of the Breathalyzer tests. At the hearing on his motion, Robbins claimed that before being stopped by Heyen, he had been at the home of a friend where he had consumed a glass of beer mixed with whiskey. Robbins said that after consuming the alcohol he went to his car and started to drive to his home, which was located three blocks away from his friend’s house. Robbins claimed that he had not felt the effects of the alcohol prior to being stopped by Heyen, but that he did feel the effects of it at the time the Breathalyzer tests were administered to him. The trial court denied Robbins’ motion to suppress.
At trial, Heyen testified that Robbins was in his custody and under his observation from the time Robbins was [489]*489stopped until Robbins performed the Breathalyzer tests and that during this time Heyen “did not observe any alcohol consumption by Mr. Robbins.” Clerk’s Papers (CP) at 217. Heyen said that 20 minutes before the first Breathalyzer test was administered Robbins conceded that “he had not consumed any alcohol since being stopped.” CP at 217. Robbins’ testimony at trial was consistent with the testimony he gave at the suppression hearing.
The trial court declined to give a jury instruction proposed by Robbins, which provided:
You may disregard the results of the test of the defendant’s breath if you entertain a reasonable doubt as to the accuracy of the test and the results thereof.
One of your duties in this case is to determine what weight or importance is to be given to the breath test result testified to in this case. In doing so, you may consider any evidence presented in this case that relates to whether or not the defendant was under the influence of alcohol.
In determining whether or not the breath test result was accurate you may consider the defendant’s testimony concerning the number of drinks he consumed and the effects of alcohol upon him, the testimony of witnesses concerning the number of drinks consumed by the defendant and the effects of the alcohol upon the defendant, and you may consider the testimony of any expert witness.
CP at 154. Instead, it instructed the jury as follows:
To convict the defendant of driving under the influence of intoxicating liquor, each of the following elements of the crime must be proved beyond a reasonable doubt:
(1) That on or about the 15th day of October, 1993, the defendant drove a a (sic) motor vehicle;
(2) (a) That the person had .10 grams of alcohol per two hundred ten liters of breath within two hours of driving; or
(b) While the person was under the influence of or affected by intoxicating liquor.
[490]*490(3) That the acts occurred in Okanogan County, Washington.
CP at 153.
The jury found Robbins guilty of DUI. Following sentencing, Robbins appealed his conviction to the Okanogan County Superior Court, which affirmed his conviction. Robbins then sought review in the Court of Appeals, Division Three. That court granted discretionary review and, following the issuance of our decision in Crediford, it affirmed Robbins’ conviction. Robbins then petitioned this court for review and we granted it.1 Robbins’ primary contention here, as it was below, is that we have held or should hold that RCW 46.61.502 is unconstitutional, and that we should, therefore, reverse his conviction and dismiss the DUI charge.
I
Robbins first contends that in Crediford this court unanimously declared RCW 46.61.502 to be unconstitutional on the basis that it exceeds the legitimate scope of the Legislature’s police power. Robbins overstates our holding in that case. In Crediford we simply concluded that subsection (3) of RCW 46.61.502, a provision which placed the burden on a defendant to prove an affirmative defense that his or her blood alcohol level was above the legal limit because of what he or she drank within two hours after driving, was unconstitutional.2 We went on to conclude, however, that the remainder of the statute passed constitu[491]*491tional muster.3 Crediford, 130 Wn.2d at 759-60 (“Our ruling that RCW 46.61.502(3) is constitutionally infirm does not, however, affect the remaining provisions of RCW 46.61.502.”). The charge against Robbins was based solely on an allegation that he violated RCW 46.61.502 by driving under the influence of alcohol and/or drugs and, significantly, the trial court did not instruct the jury that the defendant had asserted an affirmative defense or that he had any burden of proof whatsoever. It is apparent, therefore, that the portion of RCW 46.61.502 that we declared unconstitutional in Crediford had no application to this case, and, therefore, was not given any force or effect.
II
Robbins contends alternatively, that we should reconsider our decision in Crediford and strike down RCW 46.61.502 in its entirety as violative of due process on the basis that the statute exceeds the Legislature’s police power.4 Robbins asserts that RCW 46.61.502 violates due process because the statute appears to proscribe legal [492]*492behavior, i.e., drinking after driving.5 He supports this assertion by claiming that the so-called “two-hour rule” found in RCW 46.61.502(l)(a) does not regulate intoxicated drivers, and thus fails to bear a substantial or necessary relationship to the goal of prohibiting drinking and driving. The State responds that RCW 46.61.502 “does not run afoul [of] the police power” because under Crediford “the burden is still on the State to disprove the defense” of drinking after driving. Br. in Resp. to Pet. at 7.
As we noted in Crediford, “[a] party asserting that a statute exceeds the State’s police power must overcome the presumption that ‘it (1) tends to correct some evil or promote some interest of the State, and (2) bears a reasonable and substantial relationship to accomplishing its purpose.’ ” Crediford, 130 Wn.2d at 752 (quoting State v. Brayman, 110 Wn.2d 183, 193, 751 P.2d 294 (1988)); see also State v. Conifer Enters., Inc., 82 Wn.2d 94, 96-97, 508 P.2d 149 (1973). We went on to indicate in Crediford that RCW 46.61.502 does “tend[] to correct some evil or promote some interest of the State” because it serves the laudable goal of discouraging drinking and driving. Crediford, 130 Wn.2d at 752 (quoting Brayman, 110 Wn.2d at 193). Although we concluded that the statute, as enacted, was over-[493]*493broad in that a literal reading of RCW 46.61.502(l)(a) and (b) could lead a person to conclude that the Legislature intended to punish persons for the consumption of alcohol that was not associated with the operation of a motor vehicle, we avoided the necessity of striking the statute down by assuming:
[T]hat a[n] . . . implied[] element of . . . RCW 46.61.502 is that an amount of alcohol sufficient to cause a measurement of breath or blood of a defendant to register 0.10 percent or greater within two hours of driving was present in the defendant’s system while he or she was driving. This implied element (a nexus between the concentration of alcohol revealed by a blood or breath test administered within two hours of driving and the amount of alcohol present in the driver’s system when driving) mitigates Crediford’s concern that the statute criminalizes behavior not generally deemed criminal. . . . [T]he nexus element limits . . . RCW 46.61.502 to persons who drive after or while consuming intoxicants in sufficient quantity that within two hours after driving they register a reading of 0.10 percent blood or breath alcohol concentration.
Crediford, 130 Wn.2d at 755.
When considering whether a challenged statute “bears a reasonable and substantial relationship to accomplishing its purpose,” we are mindful that the Legislature possesses broad discretion in determining what are the appropriate measures to serve and protect the public interest. See Bray-man, 110 Wn.2d at 193. Further, in regard to the Legislature’s police power, this court has consistently held that:
[A]ll that is constitutionally required of the legislature is that a state of facts can reasonably be conceived to exist which would justify the legislation. If the courts can reasonably conceive of such a state of facts, they must presume that such facts actually did exist and that the statute being tested was passed with reference to them.
State v. Moore, 79 Wn.2d 51, 54, 483 P.2d 630 (1971) (quoting State v. Laitinen, 77 Wn.2d 130, 132-133, 459 P.2d 789 [494]*494(1969)). As we observed in Crediford, RCW 46.61.502 comports with, the constitutional requirements set forth in Moore:
[I]t was not irrational for the Legislature to attempt to accomplish its purpose by penalizing the excessive consumption of intoxicants associated with the operation of a motor vehicle. . . . [I]t was the Legislature’s prerogative to determine that there is a relevant relationship between a driver’s alcohol concentration of 0.10 percent or greater . . . and the ability of that driver to have safely operated a motor vehicle within the previous two hours.
Crediford, 130 Wn.2d at 754 (emphasis added).
In short, Robbins fails to convince us that we should abandon our recent decision in Crediford. See State v. Berlin, 133 Wn.2d 541, 547, 947 P.2d 700 (1997) (“Stare decisis requires a clear showing that an established rule is incorrect and harmful before it is abandoned.”). Accordingly, we reject Robbins’ contention that RCW 46.61.502 violates the Legislature’s police power.
Ill
Finally, Robbins contends that if we conclude that RCW 46.61.502 is not unconstitutional, we should remand for a new trial because the jury was not properly instructed as to the “implied element” in RCW 46.61.502, which we recognized in Crediford. Robbins buttresses this argument by citing City of Seattle v. Norby, 88 Wn. App. 545, 555, 945 P.2d 269 (1997), in which the Court of Appeals, Division One, interpreted Crediford as standing for the proposition that the trial court’s failure to instruct the jury in regard to the “implied element” is reversible error. Norby, 88 Wn. App. at 556-57. The State responds that “Norby should be overruled” on the basis that the Court of Appeals erroneously applied Crediford's “implied element” analysis. Br. in Resp. to Fet. at 4-5;
We are satisfied that the court in Norby was correct [495]*495in recognizing that the State has the burden to show a connection “between the results of the blood or breath test, and the defendant’s alcohol level at the time of driving Norby, 88 Wn. App. at 552. That conclusion logically follows from our recognition in Crediford that: (1) a nexus between the concentration of alcohol revealed by a blood or breath test administered within two hours of driving and the amount of alcohol present in the driver’s system when actually driving is an “implied element” of DUI; and (2) “the prosecution must prove every element of its case beyond a reasonable doubt.” Crediford, 130 Wn.2d at 759 (citations omitted). The court in Norby went too far, however, in concluding that the State must meet the burden of establishing the “implied element” in every case. Regrettably, we did not make it clear, as we should have, that the State need not meet the burden in cases where the defendant has not asserted that what he or she had to drink after driving influenced the blood alcohol concentration (BAC) reading. We now clarify our decision in Crediford and expressly hold that the State has the burden to show the “implied element” of a connection between the results of a defendant’s blood or breath test and his or her blood alcohol level at the time of driving only in cases where the defendant affirmatively asserts that he or she consumed alcohol after driving and that this caused the result of the blood or breath test to equal or exceed 0.10.
.The approach we announce here is consistent with that which we have taken in instances where a defendant asserts an affirmative defense. For example, when a defendant makes a claim of self-defense, he or she must set forth sufficient facts to establish the possibility of self-defense before the burden of proof shifts to the State to establish beyond a reasonable doubt that the defendant did not act in self-defense. See State v. Walden, 131 Wn.2d 469, 473, 932 P.2d 1237 (1997) (“To be entitled to a jury instruction on self-defense, the defendant must produce some evidence demonstrating self-defense; however, once the defendant produces some evidence, the burden shifts to the prosecution to prove the absence of self-defense beyond a reason[496]*496able doubt.”). Requiring the defendant to at least assert that his or her BAC was influenced by what'he or she had to drink after driving is less than what is required to assert the affirmative defense of self-defense, but is logical and consistent with the rationale we have applied in such cases. Our view is a pragmatic one which recognizes that it makes no more sense for the court to require the State to prove the absence of significant drinking after driving when such drinking is not asserted than it does to require the State to prove that a defendant did not act in self-defense when the defendant makes no such claim.
Although we decided in Crediford that RCW 46.61.502(3), the portion of the statute that provided an affirmative defense of drinking after driving, was unconstitutional, our decision here does no violence to our ruling in that case. That is so because our decision in Crediford was predicated on a concern that the statute improperly placed the burden on defendants to prove an affirmative defense which negated an, albeit implied, element of the offense—that the defendant had sufficient alcohol in his system at the time of driving to register 0.10 or more on the BAC machine within two hours of driving. Our decision here simply recognizes that drinking after driving is not presumed in every case and it keeps faith with Crediford because it requires the State to overcome the assertion, by proof beyond a reasonable doubt, that such drinking occurred. To relieve the State of that burden when there is no such assertion merely reflects a reasonable view that if a driver has not consumed alcohol after driving, the BAC test result will indicate only the level of alcohol in the driver’s system at the time of driving.
In sum, we hold that when a defendant affirmatively alleges that what he or she drank after having driven significantly influenced their BAC score, the State must assume its burden of proving that the defendant did not drink after driving or that their BAC was not influenced by what he or she drank after driving. The State does not, however, bear such a burden until the defendant raises this issue. To [497]*497the extent that Norby diverges from our holding in Crediford, it is overruled.
Looking at the facts of the case, in light of what we have stated above, it is undisputed that Robbins did not assert that he consumed alcohol following his arrest. Furthermore, there was no evidence that he did so. Indeed, all of the evidence was to the contrary. Because Robbins did not assert this defense, the State should not have the burden to disprove it. The trial court’s failure to instruct the jury in regard to RCW 46.61.502’s “implied element” was, therefore, not erroneous.
CONCLUSION
We reaffirm our holding in Crediford that RCW 46.61.502 is constitutional, with the exception of subsection (3), and that the statute is a legitimate exercise of the Legislature’s police power. In addition, we overrule City of Seattle v. Norby, 88 Wn. App. 545, 945 P.2d 269 (1997) to the extent that it holds that the State has the burden to establish a nexus between the concentration of alcohol revealed by a blood or breath test administered within two hours of driving and the amount of alcohol present in the defendant’s system when driving in cases where the defendant has not asserted that what he or she drank after driving significantly influenced their BAC score. Accordingly, we reject Robbins’ argument that this court should remand for a new trial on the basis that the trial court failed to properly instruct the jury as to the “implied element” in RCW 46.61.502 that we recognized in Crediford.
Affirmed.
Guy, C.J., Durham, Smith, and Talmadge, JJ., and Dolliver, J. Pro Tern., concur.