James Kevin Buell appeals from the district court’s decision upon judicial review affirming the Idaho Transportation Department’s order disqualifying Buell’s commercial driver’s license following his conviction for driving under the influence. For the reasons set forth below, we affirm.
I.
FACTS AND PROCEDURE
On October 21, 2006, Buell was arrested for driving a noncommercial vehicle while under the influence (DUI). After his arrest, Buell refused to take a breath alcohol concentration (BAC) test. As a result, Buell was given a suspension advisory form, his noncommercial driver’s license was seized, and he was issued a temporary thirty-day noncommercial driving permit. Buell was charged with DUI. In December 2006, pursuant to a plea agreement, Buell pled guilty to the DUI and the civil BAC refusal matter was dismissed. Buell was not sentenced until July 10, 2007. At sentencing, the district court suspended Buell’s noncommercial driver’s license for ninety days but, in accordance with the parties’ agreement, the suspension was backdated to begin on the day of Buell’s arrest — October 21, 2006. On July 19, 2007, the Idaho Transportation Department (ITD) sent Buell a notice advising him that his commercial driver’s license (CDL) was disqualified for one year beginning August 6, 2007. Buell requested an administrative hearing on his CDL disqualification. The hearing officer upheld the disqualification of Buell’s CDL, but recommended that the disqualification be made retroactive to November 21, 2006, because that was the date Buell represented he had сeased having commercial driving privileges. 1
The ITD disagreed with the hearing officer’s recommendation for a retroactive starting date of Buell’s CDL disqualification. On September 7, 2007, the ITD wrote a letter to the hearing officer requesting reconsideration of the hearing officer’s recommendation. The ITD argued that Buell’s CDL privileges were not withdrawn until he received the notification letter on July 19, 2007, and that, consequently, there was no basis for backdating the disqualification. On October 1, 2007, the ITD sent an amended notice to Buell informing him that his CDL was disqualified beginning July 10, 2007. Several days later, the ITD sent a letter to Buell informing him that it was not bound by the hearing officer’s recommendation that his CDL disqualification be backdated, that his CDL disqualification starting date had been changed to coincide with his DUI conviction date, and that, consequently, it was withdrawing its motion for reconsideration. 2 In response, Buell filed a petition for judicial review with the district *260 cоurt. On October 15, 2007, an ex parte order was issued staying enforcement of the disqualification and reinstating Buell’s CDL pending the district court’s judicial review. After a hearing, the district court upheld the hearing officer’s disqualification of Buell’s CDL. Buell appeals. 3
II.
ANALYSIS
On appeal, Buell argues that the administrative disqualification of his CDL, pursuant to I.C. § 49-335, violates the Double Jeopardy Clause of the Fifth Amendment to the United States Constitution and Article I, Section 13 of the Idaho Constitution. Spеcifically, Buell asserts that, despite being civil in nature, the administrative disqualification of his CDL is so punitive as to effectively be a criminal penalty. Buell argues that, because the disqualification of his CDL is effectively a criminal penalty, he has been subjected to multiple punishments and convictions in violation of the Double Jeopardy Clause. In addition, Buell argues that due process requires that his CDL disqualification be made retroactive because I.C. §§ 18-8002, 18-8002A, аnd 49-335 are ambiguous as to when his CDL disqualification began. Buell also argues that estoppel principles should be applied to make his CDL disqualification retroactive to November 21, 2006, because that is the date he thought his CDL disqualification began.
The Idaho Administrative Procedures Act (IDAPA) governs the review of the ITD’s decisions to deny, cancel, suspend, disqualify, revoke, or restrict a person’s driver’s license.
See
I.C. §§ 49-201, 49-330, 67-5201(2), 67-5270. In an appeal from the decision of the district court acting in its appellate capacity under the IDAPA, this Court reviews the agency record independently of the district court’s decision.
Marshall v. Idaho Dep’t of Transp.,
The Court may overturn an agency’s decision where its findings, inferences, conclusions, or decisions: (a) violate statutory or constitutional provisions; (b) exceed the agency’s statutory authority; (c) are made upon unlawful procedure; (d) are not supported by substantial evidence in the record; or (e) are arbitrary, capricious, or an abuse of discretion. I.C. § 67-5279(3). The party challenging the agency decision must demonstrate that the agency erred in a manner specified in I.C. § 67-5279(3) and that a substantial right of that party has been prejudiced.
Price v. Payette County Bd. of County Comm’rs,
A. Double Jeopardy
Buell argues that he was subjected, in consecutive prosecutions, to multiple cоnvictions and punishments for the same offense. Whether a defendant’s prosecution complies with the constitutional protection against being placed twice in jeopardy is a question of law over which we exercise free review.
State v. Santana,
Buell argues that he was subjected to multiple convictions and punishments for the same offense because, although civil in nature, the administrative disqualification of his CDL is so punitive in form and effect as to be transformed into a criminal punishment for double jeopardy purposes. In 1995, the Idaho Supreme Court held that a defendant who was convicted of DUI and whose driver’s license was subsequently suspended for ninety days pursuant to I.C. § 18-8002A was not subjected to multiple convictions and punishments in violation of the Double Jeopardy Clause of the United States and Idaho Constitutions.
Talavera,
Were we to rely on Talavera, we would consider whether the one-year disqualification of Buell’s CDL, as applied to him, bears a rational relationship to a legitimate remedial purpose. The Court in Talavera noted that the purpose of I.C. § 18-8002A was to promote safety by quickly disqualifying drivers who pose a hazard to the public at-large. Similarly, the remedial purpose оf I.C. § 49-335 is to provide for the safety of the public by removing problem drivers from the road through disqualification. Statement of Purpose, SB 1001 (1989). Because I.C. § 49-335 serves the same legitimate remedial goals as I.C. § 18-8002A, we would conclude, under Talavera, that the disqualification of Buell’s CDL was proportionate to the state’s remedial purpose and did not rise to the level of a criminal punishment. Therefore, we would hold that the disqualification of Buell’s CDL did not subject him to multiple convictions and punishments in violation of the Double Jeopardy Clause.
Subsequent case law has, however, called the analytical method utilized in
Talavera
into question. In conducting its analysis, the
Talavera
Court relied almost exclusively on
United States v. Halper,
In 1997, however, the United States Supreme Court disavowed the double jeopardy analysis used in
Halper. Hudson,
Under
Hudson,
we must first determine whether the Idaho legislature intended for the one-year CDL disqualification under I.C. § 49-335 to be civil or criminal. Whether a statutory scheme is civil or criminal is a question of statutory construction.
Smith v. Doe,
Nevertheless, we must also inquire whether the statutory scheme governing the CDL disqualification imposed upon Buell was so punitive either in purpose or effect as to transform what was intended as a civil remedy into a criminal penalty. To make this determination, we must weigh the seven factors laid out in
Hudson.
It is important to note that these factors must be considered in
*263
relation to the statute on its face and that only the clearest proof will suffice to transform what has been denominated a civil remedy into a criminal penalty.
Hudson,
Secоnd, we must consider whether driver’s license suspensions have been regarded as punishment. Idaho appellate courts have not viewed driver’s license suspensions as punishment.
See Talavera,
Third, we must consider whether a one-year- CDL disqualification comes into play only on a finding of scienter. Under I.C. § 49-335(l)(a), the prerequisite for a one-year CDL disqualification is conviction of а DUI. Under I.C. § 49-335(2), the prerequisite for a one-year CDL disqualification is refusal or failure of a BAC test. There is no scienter required for a disqualification under either subpart.
Fourth, we must consider whether the behavior attached to the one-year CDL disqualification is already a crime. We note that the conduct sanctioned in the instant case is also criminalized by I.C. § 18-8004. However, this is insufficient to transform the one-year CDL disqualification imposed on Buell into a criminal punishmеnt.
See McKeeth,
Fifth, we must consider whether a one-year CDL disqualification promotes the traditional aims of punishment, retribution, and deterrence. Buell, citing to
State v. Ankney,
Sixth, we must consider whether there is a purpose other than punishment that could be assigned to the one-year CDL disqualification and whether the disqualification is excessive in relation to the alternative purpose assigned to it. As noted above, the purpose of I.C. § 49-335 is to remove problem drivers from the road through disqualification. Statement of Purpose, SB 1001 (1989). The right of a citizen to operate a motor vehicle is substantial, but it is also subject to reasonable regulation by the state in the exercise of its police powers.
Talavera,
Based on the Hudson factors, we hold that a one-year CDL disqualification is civil in nature and does not rise to the level of a criminal punishment for double jeopardy purposes. Therefore, we affirm the district court’s order upholding Buell’s one-year CDL disqualification.
B. Disqualification Starting Date
Buell argues that his due process rights were violated because I.C. §§ 18-8002, 18-8002A, and 49-335 are ambiguous and did not adequately notify him of when his CDL disqualification would begin. Idaho Code Sections 18-8002 and 18-8002A are part of the criminal code. Idaho Code Section 18-8002 provides for suspension of a noncommercial driver’s license when a driver has refused to submit to an evidentiary BAC test. Idahо Code Section 18-8002A provides for the suspension of a driver’s license when a driver has failed an evidentiary BAC test. The motor vehicle code prescribes additional consequences that result from a motorist’s refusal to submit to evidentiary testing or for failing such testing. I.C. § 49-335. Idaho Code Section 49 — 335(l)(a) provides that a CDL holder will be disqualified from operating a commei’cial vehicle for one year if convicted of driving under the influence. Idaho Code Section 49-335(2) provides that a CDL holder will be disqualified from operating a commercial vehicle for one year if the person refuses to submit to or fails a BAC evidentiary test. A disqualification under I.C. § 49-335 is in addition to a suspension under I.C. §§ 18-8002 or 18-8002A and relates solely to the driver’s CDL. A holder of a CDL is presumed to have knowledge of the laws governing CDLs.
See Wilson v. State,
Buеll also argues that it was unclear whether his CDL disqualification was pursuant to I.C. §§ 49-335(1) or 49-335(2) and, therefore, whether his CDL disqualification was to begin at the moment he refused the BAC or, alternatively, on the date of his conviction. Buell’s refusal of the evidentiary BAC test was dismissed pursuant to a plea agreement. Therefore, his CDL disqualification was based, not on his refusal of the BAC, but on his conviction for DUI. Buell was given no reason to believe that his CDL had been suspended prior to July 19, 2007, which is the date that Buell first received notice from the ITD that he was disqualified from operating a commercial vehicle. Until the ITD issued its notice of disqualification to Buell on July 19, 2007, no action had been taken by the ITD with respect to Buell’s CDL. Because Buell suffered no action against his CDL until July 19, 2007, there was no basis for the district court to order a retroactive disqualification of his CDL. While Buell may have been confused as to when the period of his CDL disqualification was to *265 begin, his сonfusion does not mean that the statute is ambiguous. Therefore, the statute is not ambiguous as applied in this case, and Buell was not denied due process.
Finally, Buell argues that estoppel principles should be applied to make his CDL disqualification retroactive to November 21, 2006, because he believed his disqualification began on that date. Estoppel may not ordinarily be invoked against a government or public agency functioning in a sovеreign or governmental capacity.
Young Elec. Sign Co. v. State ex rel Winder,
III.
CONCLUSION
A one-year CDL disqualification under I.C. § 49-335 is civil in nature and does not rise to the level of a criminal punishment for double jeopardy purposes. Buell was not denied due process because the CDL disqualification statute was not ambiguous as to the date Buell’s CDL disqualification was to begin. In addition, estoppel is not an appropriate remedy against the ITD in this case. Therefore, the district court’s decision upon judicial review affirming the administrative disqualification of Buell’s CDL is affirmed. Costs, but not attorney fees, on appeal are awarded to respondent, Department of Transportation.
Notes
. Buell stated at the administrative hearing that, after his arrest on October 21, 2006, his driver’s license was suspended and he was issued a thirty-day temporary permit. The thirty-day permit ended on November 21, 2006. Buell stated that he had been without any driving privileges (either commercial or noncommercial) since that time. There is no independent evidence in the record to support the conclusion that Buell's CDL was disqualified during this timeframе. The record demonstrates that Buell was first notified that his CDL was disqualified on July 19, 2007.
. The ITD based its change of the starting date for Buell’s CDL disqualification on the Federal Motor Carrier Safety Administration (FMSCA) regulations governing commercial driver’s licenses. 49 C.F.R. 383.51. The FMSCA has issued guidance interpreting this section. According to the guidance, this regulation requires states to use the date of conviction, rather than the offense date, to calculate the starting and ending date of driver’s license disqualifications.
. Enforcement of Buell’s CDL disqualification was stayed pending this appeal.
. The Idaho Appellate Courts have consistently applied one analysis to double jeopardy claims arising under both the United States and Idaho Constitutions when the issue is whether a civil sanction is so punitive as to be criminal for double jeopardy purposes.
See Berglund v. Potlatch Corp.,
. In addition, this Court has previously utilized
Hudson
and not
Halper
in its analysis of whether a civil sanction should be viewed as a criminal punishment for double jeopardy purposes.
McKeeth,
