delivered the Opinion of the Court.
The defendant, Joseph Padilla, pled guilty in Denver District Court to one count of assault in the first degree.
1
At his sentencing hearing, the defendant filed a motion to suppress the use of three prior felony convictions in the sentencing determination on the ground that these convictions were unconstitutionally obtained. The sentencing court denied the motion as barred by the statute of limitations, section 16-5-402, 8A C.R.S. (1986), noting the defendant’s failure to plead justifiable excuse or excusable neglect, statutorily recognized exceptions to the time limitation.
See
§ 16-5-402(2)(d). The court then sentenced the defendant to eighteen years imprisonment. In
People v. Padilla,
I.
On April 30, 1991, the defendant was arrested in connection with an assault on his wife that left her with extensive injuries. The defendant was charged with one count each of second degree assault 3 and third degree assault. 4 The prosecution subsequently amended the charges to add three habitual criminal counts pursuant to section 16-13-101, 8A C.R.S. (1986). The habitual criminal counts were based on the defendant’s three prior felony convictions: (1) a 1970 robbery conviction in Adams County; (2) a 1973 second degree murder conviction in Jefferson County; and (3) a 1973 second degree murder conviction in Denver. Pursuant to a plea agreement, the prosecution added one count of first degree assault, 5 to which the defendant pled guilty, and dropped the remaining charges, including the habitual criminal counts.
The parties stipulated to a sentencing range of four to twenty years imprisonment. In the presentence investigation report, the reporting probation officer listed the defendant’s three prior convictions as factors for the sentencing court to consider in assessing punishment. At the sentencing hearing, the defendant moved to suppress the use of these prior felony convictions for sentence enhancement purposes. The defendant alleged that all three convictions were unconstitutionally obtained and thus could not be considered by the sentencing court in selecting a sentence. Specifically, the defendant asserted that his 1970 robbery conviction and his 1973 second degree murder conviction were invalid because, among other reasons, when he offered the guilty pleas upon which those convictions were based he did not understand *604 the nature of the charges filed against him or the scope of his constitutional and statutory rights. In addition, he challenged the validity of his 1973 conviction for second degree murder, which was based on a jury verdict, because, among other reasons, he was not advised of his right to testify and was denied effective assistance of counsel.
In ruling on the defendant’s motion, the sentencing court noted that the statute of limitations period for collateral attacks on prior convictions, prescribed by section 16-5-402, 8A C.R.S. (1986), had expired with respect to each of his three prior convictions. Because the defendant did not aver in his motion that the delay was based on justifiable excuse or excusable neglect, the court refused to consider the validity of the underlying convictions. The court also refused defense counsel’s offer to make an oral record regarding justifiable excuse or excusable neglect. The court proceeded with the sentencing hearing and explicitly relied to some degree on the prior convictions in sentencing the defendant to eighteen years imprisonment.
The defendant appealed his sentence to the court of appeals, asserting, among other arguments, that the time bar on collateral attacks codified at section 16-5-402 is unconstitutional on its face and as applied, and that the trial court erred in raising the time bar issue on its own initiative. The defendant sought an opportunity to present evidence of justifiable excuse and excusable neglect as well as evidence that his prior convictions were unconstitutionally obtained. The court of appeals, in
People v. Padilla,
The court of appeals remanded the case to the district court with the following instructions:
The cause is remanded to the trial court with directions that the trial court consider such evidence as defendant may wish to present in an attempt to show that his untimely attack on these prior convictions was the result of justifiable excuse or excusable neglect. Should the court conclude that defendant’s untimely attack was not the result of justifiable excuse or excusable neglect, then subject to an appeal of that decision, defendant’s sentence is affirmed. Should the court determine that defendant’s untimely filing was, in fact, the result of justifiable excuse or excusable neglect, then the court must determine the validity of defendant’s allegations that the prior convictions were obtained in violation of his constitutional rights. In the event either or both of the prior convictions at issue [6] are determined to have been so obtained, defendant must be resentenced based on that determination.
Id. Without specifically addressing the issue, the court of appeals, by the terms of its order, assumed that the defendant was entitled to an evidentiary hearing on the validity of prior convictions during the sentencing proceeding.
The prosecution petitioned this court for certiorari review of the court of appeals’ decision. We granted certiorari to determine (1) whether the defendant is entitled to an evi-dentiary hearing under the pleading and evi-dentiary standards applicable to a collateral attack under Crim.P. 35(c) to challenge the validity of prior convictions during a discre
*605
tionary sentencing hearing, and (2) whether the pleading requirements for justifiable excuse and excusable neglect set forth in
People v. Wiedemer,
II.
We have consistently held that due process considerations prevent the use of criminal convictions obtained in violation of an individual’s constitutional rights for the purpose of enhancing punishment in a subsequent criminal proceeding.
E.g., People v. Quintana,
III.
The defendant asserts that the sentencing court’s refusal to grant him an evidentiary hearing on the validity of his prior convictions deprived him of due process. Therefore, we begin our analysis with a review of the potential constitutional underpinnings for the right to an evidentiary hearing at sentencing claimed by the defendant.
A.
In
Custis v. United States,
— U.S. -,
The Supreme Court held that in the absence of a claim that the disputed convictions were obtained in violation of his right to counsel, the defendant had no federal constitutional right to attack those convictions during the federal sentencing process.
Id.
at -,
The Court based its decision in part on administrative and policy concerns. The Court noted the administrative difficulties inherent in assessing claims of ineffective assistance of counsel and failure to assure that a guilty plea was voluntary when such claims
*606
“may date from another era, and may come from any one of the 50 states.”
Custis,
— U.S. at -,
We are cognizant of the differences between the federal sentencing process at issue in Custis, in which the existence of a prior felony mandated sentence enhancement, and the discretionary sentencing format before us today, in which the existence of a prior felony is simply one of the factors to be considered by the court in exercising discretion in sentencing. The facts of this ease, however, do not require us to determine whether the Custis holding is applicable to discretionary sentencing. The defendant did not, and based on the record apparently cannot, allege that he was denied counsel during the proceedings that gave rise to his three prior convictions. Therefore, we need not address whether Custis guarantees a defendant a constitutional right to challenge at a discretionary sentencing hearing prior convictions obtained in violation of the defendant’s right to counsel.
We do conclude, however, that the
Custis
decision is dispositive of the defendant’s claim that he has a federal constitutional right to challenge his prior convictions at the discretionary sentencing proceeding on bases other than that he was indigent and denied counsel.
Custis
limited the constitutional grounds for attacking a prior conviction in the context of sentencing under the ACCA, a mandatory punishment enhancement statute. In the present case, the defendant seeks to challenge his convictions during a discretionary sentencing proceeding, a type of proceeding in which the defendant is traditionally afforded fewer protections.
Compare Williams v. New York,
B.
The defendant argues that even in the absence of a federal constitutional right to attack prior judgments of conviction at sentencing, we should recognize such a right under the Colorado Constitution. We disagree. In
Wiedemer,
The defendant contends that our failure to recognize a right to a hearing on the constitutionality of prior convictions at sentencing will compromise the due process rights protected by our consistent prohibition on the use of constitutionally invalid convictions in subsequent cases.
See supra
part II;
see also Quintana,
We do not agree, however, that the same heightened protection is required for defendants subject to discretionary sentencing, in which the existence of prior convictions does not mandate enhanced punishment. The discretionary sentencing process is conducted pursuant to section 16-11-102, 8A C.R.S. (1986 & 1995 Supp.), and Crim.P. 32(b). Following a determination of guilt in a felony case, a probation officer prepares for the court a presentence report which includes, but is not limited to, “information as to the defendant’s family background, educational history, employment record, and past criminal record.” § 16-ll-102(l)(a). The sentencing court then considers this information and any information presented at the sentencing hearing and exercises broad discretion in weighing the various factors and fixing punishment.
People v. Blizzard,
In recognition of the more limited impact of individual sentencing factors in discretionary sentencing, we have not required adherence to heightened due process standards of evidentiary presentation. The prosecution is not required to prove any of the sentencing factors by evidence presented in accordance with the due process procedures required in a guilt trial on the merits of the case.
Wolford v. People,
*608 Contrary to the defendant’s contention, these restrictions on a defendant’s ability to challenge prior convictions affect only the procedural method of addressing these convictions and not the substantive rights of defendants. In People v. Germany, we stated:
Thus, while the state may enact reasonable requirements for collateral challenges to prior criminal convictions, thereby ensuring that claims will be raised at a time when they may be easily determined and necessary corrective action taken, it may not do so without providing a criminally accused a meaningful opportunity to challenge allegedly unconstitutional convictions which the government seeks to use against him in a pending criminal prosecution.
IV.
Because we find no constitutional support for the defendant’s claim to an evidentiary hearing on the validity of prior convictions during his discretionary sentencing proceeding, we now look for evidence of such a right in the Colorado statutes that govern the processes of sentencing and postconviction review.
A.
As explained above, discretionary sentencing is governed by section 16-11-102, 8A C.R.S. (1986 & 1995 Supp.), and Crim.P. 32(b). Prior to the sentencing hearing, the court receives a presentence report prepared by a probation officer which contains information regarding the defendant’s past family, educational, employment, and criminal record. After receiving the presentence report, the court must grant the defendant “an opportunity to make a statement in his own behalf and to present any information in mitigation of punishment.” § 16-11-102(5), 8A C.R.S. (1986); Crim.P. 32(b). This right to present information is limited, however, by the context of the proceeding in which it occurs.
*609
The purpose and function of discretionary sentencing in the administration of criminal justice necessarily limit the scope of the sentencing proceedings. The discretionary sentencing process is intended to allow individualized sentencing; the court tailors a sentence consistent with the defendant’s prior behavior and other factors.
See Williams,
To avoid compromising the flexibility of the sentencing process, we have resisted defendants’ efforts to expand their right to present information and have not interpreted that right to encompass an evidentiary hearing. Although a defendant has a right to be heard regarding the accuracy of matters in his presentenee report, the prosecution is not required to prove the sentencing factors by the same quality of evidence required in a guilt trial on the merits of the ease.
Wol
ford,
Were we to endorse the defendant’s position that an evidentiary hearing on the validity of prior convictions is required during sentencing, the entire discretionary sentencing process would be disrupted. The sentencing court would be required to play the role of a second trial court, revisiting testimony and other evidence already brought before a prior tribunal. In
Williams,
the United States Supreme Court recognized the potentially disastrous impact on the administration of criminal justice if all sentencing factors were required to be proved through an evidentiary proceeding: “[T]he modern probation report draws on information concerning every aspect of a defendant’s life. The type and extent of this information make totally impractical if not impossible open court testimony with cross-examination. Such a procedure could endlessly delay criminal administration in a retrial of collateral issues.”
B.
We next examine the postconviction review statute, § 18-1-410, 8B C.R.S. (1986 & 1995 Supp.). This section establishes an entitlement to apply for postconviction review, § 18-1-^10(1), but defers to the Colorado Rules of Criminal Procedure for procedural guidelines, § 18-l-410(2)(a). The rule governing postconviction remedies is Crim.P. 35(c). Although Rule 35(c) does not specifically authorize postconviction review during a sentencing proceeding, neither does it place any explicit time limitations on when review may be sought. However, the rule does require the defendant to file the motion for relief in the court that imposed sentence, i.e., the jurisdiction in which the challenged conviction originated. This requirement suggests that postconviction challenges under Rule 35(c) are not appropriate during sentencing proceedings for subsequent crimes because the court presiding over the second proceeding often will not have jurisdiction over the prior conviction.
The defendant in the present case, however, attempts to distinguish his motion to suppress the use of his prior convictions in the sentencing hearing from an application for postconviction relief under Rule 35(c). According to the defendant, because a suppression motion does not result in the vacation of the underlying conviction, with attendant potential retrial, it represents an administrative gain over the more cumbersome Rule 35(c) procedure. 8 Although we recognize the differences between the two types of relief, we are not convinced that the distinctions are relevant to the issue of the propriety of challenges to prior convictions during discretionary sentencing proceedings.
In the situation presented here, a motion to suppress prior convictions and a motion to vacate these same convictions are merely different means of obtaining the same end— prevention of the use of those convictions in a subsequent proceeding. Regardless of which motion is filed, the sentencing court must undertake a full evaluation of the constitutionality of the prior convictions before making any determination as to their use. Consequently, a motion to suppress, if accompanied by an automatic evidentiary hearing, would cause a delay in the sentencing process equal to any slowdown associated with a motion to vacate. Thus, to allow full suppression hearings at sentencing would effectively negate the administrative advantages of discretionary sentencing by circumventing the limitations that currently prevent other postconviction challenges during sentencing.
9
In
Wiedemer,
we did not distinguish between suppression motions and Rule 35(e) motions for the purposes of applying the statute of limitations for collateral attack,
V.
For the foregoing reasons, we conclude that an evidentiary hearing on the constitutional validity of prior convictions during discretionary sentencing is neither constitutionally nor statutorily guaranteed. If, as in the present case, the defendant has not attacked the constitutional validity of his prior convictions before the sentencing hearing, he retains the right to challenge the convictions after sentencing under Crim.P.
*611
35(c)
10
or comparable procedures available in other states. If such a challenge is successful, he may then apply for reopening of any sentence entered after consideration of the invalid convictions.
Accord Custis,
— U.S. at -,
Notes
. § 18-3-202, 8B C.R.S. (1986 & 1991 Supp.).
. We use the term ''discretionary sentencing proceeding” to denote a proceeding in which the establishment of a prior conviction or convictions is a factor to be considered by the court in exercising discretion in arriving at the sentence but does not mandate an increased sentence.
. § 18-3-203, 8B C.R.S. (1986 & 1991 Supp.).
. § 18-3-204, 8B C.R.S. (1986).
. § 18-3-202, 8B C.R.S. (1986 & 1991 Supp.).
6. Although the court of appeals refers to only two prior convictions in its remand order, the defendant’s motion to suppress and other documentation in the record establish that the defendant sought to suppress all three of his prior convictions.
. The defendant cites several of our earlier cases in support of his position that postsentencing challenges provide inadequate protection against the use of prior convictions.
See, e.g., Apodaca v. People,
. The defendant argues that motions to vacate prior convictions will result in subsequent retrials of those convictions and clog the court system. In this case, however, the defendant has completed the sentences for his prior crimes and is not likely to be retried.
. Suppression would also leave the conviction in place, with the result that an additional proceeding in the court in which the conviction was obtained would be necessary to prevent future use of the conviction in other cases.
. In any future motion filed pursuant to Rule 35(c), the defendant must comply with the Wied-emer pleading requirements regarding justifiable excuse and excusable neglect to overcome the statutory time bar of section 16-5-402, 8A C.R.S. (1986). People v. Wiedemer, 852 P.2d-424, 440 n. 15 (Colo.1993).
