delivered the opinion of the court.
I. Introduction
Wе granted certiorari to review the court of appeals' unpublished opinion in People v. Moody, No. 04CA0361,
II. Facts and Procedural History
On the morning of May 13, 2003, North-glenn police were summoned to a Ramada Inn Hotel to investigate a purported bomb threat. When they arrived, the hotel manager recommended the police speak with several hotel cccupants-Matthew Moody and his three companions-who had been reluctant to present identification when сhecking in the night prior. The officers knocked on the door of the room occupied by Moody, who answered the door. The officers asked whether they could come in to talk to Moody, and he allowed them to enter.
Onee inside, the officers discovered the room was in disarray, strewn with bottles, food containers, and personal effects. Two women were sleeping, and both Moody and Michael Yamaguchi, the other two occupants, aрpeared to have recently awakened. The officers asked Moody whether there were any illegal items in the room, and Moody produced a marijuana pipe. Another officer noticed a zippered black attaché case on the floor, which he pushed with his foot while inquiring about its contents.
Having discovered these items, the officers asked for permission to search the entire room. All the occupants, including Mоody, assented to the search, which yielded a .25 caliber handgun and bullets concealed inside the CD case that had already been removed from the bag. After running the serial number of the handgun through a police database, the officers learned the gun had been reported as stolen.
Moody and his companions were arrested. During a tape-recorded interview conducted thereafter, a detective interrogated him
At trial, Moody moved to suppress evidence uncovered during the search because, he argued, the police were without a warrant, they did not obtain valid consent, and all statements and evidence obtained were fruit of the illegal search of the attaché case. Following the testimony of four officers-albeit absent Moody's testimony, as he chose not to take thе stand-the trial court denied Moody's motion to suppress, concluding that the contact between the officers and the occupants of the room was a voluntary encounter, rather than a seizure, to which Moody had consented when he allowed the officers to search the room. The trial court also rejected Moody's claim that the officers were required to seek consent to search each individual item in the room. After a two-dаy jury trial, at which Moody testified, he was convicted of conspiracy to commit menacing by use of a deadly weapon.
On appeal, Moody challenged the trial court's order in the suppression hearing, renewing his complaint that the evidence used against him was the product of an unlawful search. In an unpublished, unanimous opinion, the court of appeals rejected Moody's reassertion of this claim. Notably, however, it did so on the grounds of standing, аn issue which the prosecution had not raised before either the trial court or the court of appeals. The appellate panel relied on Moody's trial testimony as having established that Moody had no proprietary or possessory interest in the bag or its contents and, as such, it found that he did not have standing to object to the search. We now reverse the court of appeals and remand the case back to that court.
III. Court of Appeals' Reliance on Moody's Trial Testimony
As an initial mаtter, we address the court of appeals' reliance on Moody's trial testimony to determine that he was "without any privacy interest in the bag or its contents" and thus had "abandoned any privacy interest he might have had" when his trial testimony failed to contradict the officers' suppression hearing testimony that Moody had disavowed any interest in the bag or its contents. People v. Moody, at *1.
At the suppression hearing, Moody did not testify, but four officers did so, each giving conflicting answers as to whether Moody had claimed ownership of the attaché case and the handgun at the time of the search. At trial, Moody did take the stand; he explained that the bag and most of its contents never belonged to him, and that at one time he owned the masks and the CD case in the bag but had relinquished interest in them prior to the search.
Thus, the court of appeals held that Moody's trial testimony barred his challenge to the search on appeal, pointing to People v. Thorpe,
We formally adopt this rule because basic principles of fairness dictate we must. To hold, аs the court of appeals did, that a defendant's trial testimony may be used by an appeals court to uphold a trial court's suppression ruling would be to sanction a chilling effect on a defendant's decision to testify at trial. The knowledge that an appellate court will review not only the suppression hearing but also the entirety of the trial may well dissuade a defendant from taking the stand at trial for fear that any statement might be construed to eradicate what may be, in actuality, a very legitimate challenge to a trial court's denial of suppression. See State v. Smith,
Further, without notice to the defense that the questions entertained at the suppression hearing are not final but instead subjeсt to factual supplementation at trial, the defendant might neglect to challenge certain trial testimony that bolsters the adverse pretrial suppression ruling but is not particularly damaging on the issue of guilt or innocence. LaFave, Search and Seizure, (4th ed.2004) § 11.7(d), p. 457-58. By the same token, were an appellate court to rely on the trial record in its review, the prosecution would, in effect, be accorded a second opportunity to pad the appellate record at trial by injecting evidence that could be used on appeal to affirm what would otherwise be an erroneous suppression ruling. Trusty v. State,
Because we cannot endorse a procedure thаt encumbers a defendant's ability to take the stand in his own defense while he contests the legality of a search or seizure, we conclude an appeals court may only look to the suppression hearing in reviewing a lower court's ruling on such matters. As such, the court of appeals erred in reviewing both the suppression record and the trial proceedings in its review of standing.
IV. Court of Appeals' Sua Sponte Review of Standing
We next turn to the propriety of the court of appeals' decision to address the question of standing sua sponte when the prosecution failed to raise the issue in the suppression hearing, at trial, or on appeal. Our starting point is the basic principle of appellate jurisprudence that arguments not advanced on appeal are generally deemed waived. People v. Salazar,
Thus, in Steagald v. United States,
This court has positively cited Steagaid when addressing situations in which the prosecution failed to raise standing before the trial court. Seе People v. McKinstrey,
This is not to say that Colorado appellate courts are absolutely precluded from taking up the issue of standing sua sponte. After all, appellate courts have the discretion to affirm decisions, particularly denial of suppression motions, on any basis for which there is a record sufficient to permit conclusions of law, even though they may be on grounds other than those relied upon by the trial court. People v. Aarness,
However, when opting to exercise the power of sua sponte review, appellate courts must chart their course following the guideposts set forth by the United States Supreme Court:
In exceptional cireumstances, especially in criminal cases, appellate courts, in the pub-lie interest, may, of their own motion, notice errors to which no exception has been taken, if the errors are obvious, or if they otherwise seriously affect the fairness, integrity, or public reputation of judicial proceedings.
United States v. Atkinson,
Critical to these considerations of fairness in sua sponte review is the existence of a complete and factually developed lower court record. This is because it is fundamentally unfair to entrap an unwary defendant by raising a lack of privacy interest for the first time on appeal unless it is absolutely clear that he had no reasonable expectation of privacy. United States v. Pervaz,
On this issue, Combs v. United States,
Combs is illustrative as to why restraint is often the better course, and it sheds light on the hazards encountered by the court of аppeals in navigating sua sponte review: it placed itself in the tenuous position of resolving fundamental facts that had not been identified during the suppression hearing. Throughout Moody's appeal, questions lingered as to who had rented the hotel room, who owned the attaché case and the guns, and the relationship, if any, between the seized objects and the occupants of the hotel room. In the suppression hearing, the four officers offered сonflicting testimony on these issues, and the trial court judge never made findings of fact about them. Clearly, had the court of appeals adhered to the injunction we issue today against the use of trial testimony in reviewing a lower's courts suppression ruling, supra, the factual record available for review would have been too sparse to support any kind of determination as to Moody's standing.
Thus, we hold that while the court of appeals certainly has the рower to address a standing issue sua sponte, it may not do so in fairness to the defendant if resolution of the issue cannot be based on a factually complete and straightforward record. Combs,
As a final note, we acknowledge that in some cireumstances, where an appellate court has chosen to engage in sua sponte review, remand back to the district court for further factual findings might be appropriate. However, we strongly caution against sua sponte review and remand when, givеn the passage of time, there is no reasonable possibility that the trial court could develop a better record upon which to proceed. Only in limited situations, such as with interlocutory appeals, has this court seen fit to remand for further findings. See, eg., Spies,
V. Conclusion
We conclude today that an appeals court may only properly consider evidence presented at the suppression hearing when reviewing a trial court's suppression ruling. We also hold that appellate courts may address issues of standing sua sponte, regardless of whether the prosecution may be deemed to have waived its right to address the question. However, we disapprove of doing so where, as here, the factual record was undeveloped and could not be supplemented with reliable testimony upon remand, given the passage of time. In this case, the record was barren of the facts needed to determine whether Moody had standing to challenge the police searches, particularly when only the evidence presented at the suppression hearing is considered. Accordingly, the appeals court erred by addressing standing sua sponte. We therefore reverse the opinion of the court of appeals and remand the case to that court for further proceedings consistent with this opinion.
Notes
. At the suppression hearing, the officer testified that he could not remember whether he kicked the bag accidentally or whether he deliberately pushed it with his foot.
. The court of appeals relied on several lines from Moody's direct testimony that appear, based on our review of the record, not to have been intended to address the issue of standing to challenge the search.
. Questioning whether Steagald and Combs can be reconciled, some courts and commentators have postulated that Steagald governs those cases in which the government previously made affirmative assertions of facts such as would confer standing, while Combs is controlling where the government simply remained silent or neglected to raise standing in lower courts. See, eg., La-Fave, Search and Seizure, § 11.7(e), p. 466-68; Hansen,
