ON CERTIORARI TO THE UTAH COURT OF APPEALS
{1 The State petitioned for review of a court of appeals' decision reversing the trial court's denial of Douglas B. James's motion to suppress evidence. After the trial court denied James's motion to suppress, he was convicted of driving under the influence of aleohol. On appeal, the court of appeals held that a police officer violated James's Fourth Amendment rights when he opened the door of James's truck, while James was seated inside the truck, for the purpose of investigating a citizen's report of reckless driving. See State v. James,
BACKGROUND
T2 On March 16, 1996, a citizen approached Utah Highway Patrol Trooper Jason Kendrick and reported that he had just seen a reckless driver, The citizen stated that a dark-colored pickup truck was "all over the road" and had "hit or ... almost struck" three other vehicles. The citizen was able to provide Kendrick with the truck's license number, approximate location, and direction of travel. Kendrick contacted highway patrol dispatch and confirmed that the license number matched the vehicle description provided by the citizen. Kendrick obtained the registered address of the truck's owner and drove to that address. As he neared the residence, he saw a truck matching the citizen's and dispatcher's description enter the driveway, where it stopped and remained with its brake lights on. Kendrick pulled up behind the truck with his headlights on, left his patrol car, and approached the truck's driver's-side door. During the time it took Kendrick to stop and approach, no one attempted to leave the truck.
{ 3 Kendrick looked in the window and saw two persons, James, who was in the driver's seat, and a female in the passenger seat. 1 Kendrick opened the door and asked the *578 driver, James, to get out of the truck. Once the door was open, Kendrick saw a 12-pack of beer on the passenger-side floor of the cab, with one can opened. Kendrick and James walked to the front of the truck, where Kendrick asked to see James's driver's license. James dropped his license when he pulled it from his wallet. Kendrick noted that James smelled strongly of alcohol, his face was flaccid, his speech slurred, and his eyes were droopy and bloodshot. Kendrick also observed that James "appeared to be unstable, unable to stand straight" without keeping his feet apart or moving. Kendrick expressed concern about the possibility that James had been involved in an accident. Kendrick and James walked around the truck and seanned it for signs of damage, but found none.
[4 At about this time, the female passenger left the vehicle and "was very upset ... yelling, sereaming, that kind of thing." Kendrick became concerned for his safety, told James to remain where he was and returned to his patrol car to call for backup. James instead went inside his home. When the backup officer, Trooper Arlow Hancock, arrived, he and Kendrick entered the attached garage through the open garage door. They knocked on the door leading from the garage into the house and told James that if he did not come out they would come in to get him. James came out and performed a standard field sobriety test, which he failed. When James attempted to walk away again, the officers arrested him. James was taken to the Cache County jail, where he refused to take any further sobriety tests or a breathalyzer test, The State charged James with driving under the influence and having an open container of alcohol in his vehicle.
15 At trial, James moved to suppress evidence of his intoxicated condition. He asserted three Fourth Amendment grounds for suppression: (1) Kendrick initially lacked reasonable suspicion to stop his truck or detain him; (2) Kendrick opened the door to his truck without probable cause; and (3) Kendrick and Hancock lacked the probable cause and exigent circumstances necessary to enter his garage without a warrant. The trial court denied James's motions. A jury convicted James of driving under the influence, but acquitted him on the open container charge.
T6 On appeal, the court of appeals addressed only the argument relating to Kendrick's opening of the truck door. The court of appeals ruled that the officer's opening of the vehicle door constituted a search of the vehicle rather than an investigative detention and that the search was illegal. See James,
T7 We granted the State's petition for certiorari. On certiorari review, the State argues that the court of appeals construed cases prohibiting police from opening a vehicle door in certain cireumstances too broadly and out of context. Specifically, the State contends that where an officer has the right to order a person to temporarily leave a vehicle, the officer's mere opening of a vehicle door cannot constitute an illegal search. The State also argues that the court of appeals erred in its application of the inevitable discovery doctrine.
ANALYSIS
18 "On certiorari, we review the decision of the court of appeals, not the decision of the trial court." State v. Harmon,
T9 We begin our analysis with a brief statement of two fundamental and related tenets of Fourth Amendment caselaw. First, the presumptive rule relating to reasonable searches and seizures is that searches may not be conducted without a warrant supported by probable cause. See Katz v. United States,
110 Due to the mobile nature of vehicles and their highly-regulated status, persons traveling in vehicles have a lesser expectation of privacy than they would have within a private dwelling. See California v. Carney,
§11 The specific issue on certiorari in this case concerns the Fourth Amendment propriety of opening the driver's-side door of James's truck for the purpose of speaking to James and requesting that he step out of the vehicle. As a preliminary matter, we note that the facts of the case definitively demonstrate that Kendrick's detention of James was based on more than adequate reasonable suspicion.
4
Kendrick's investigation was founded on a citizen's detailed report of a reckless driving pattern that was consistent with driving under the influence. The citizen's identification of the license plate and description of the truck were corroborated in all material respects by the highway patrol dispatch office, and, subsequently, by Kendrick's own observation. Kendrick also viewed James's pickup pulling into the driveway at the registered address. Thus, under the totality of the circumstances, Kendrick had the right and the authority to temporarily detain James and investigate the report of reckless driving.
5
It follows that Kendrick
*580
was legally authorized to order James to step from the cab of his truck.
6
See Mimms,
112 The court of appeals' analysis overlooks the fundamental distinction between detention and questioning of James himself (a procedure specifically authorized by Mimms) and a search for physical items of evidence not in plain view, such as narcotics or firearms. In this regard, we note that the issue of Kendrick's discovery of the open container is not before us, nor was it an issue before the court of appeals. James was acquitted on the open container charge.
113 James's defense of the court of appeals' decision further assumes that there is a functional distinction between Kendrick's opening the door himself and his requiring James to open it. The court of appeals cited State v. Larocco, wherein this court established, by plurality decision, a rule prohibiting warrantless searches of vehicles in the absence of probable cause and exigent circumstances. See
{14 Although our resolution of this issue renders immaterial the court of appeals' conclusion that the inevitable discovery exeeption was inapplicable, the State has expressed concern that the court of appeals' holding on that issue will establish incorrect precedent. We therefore briefly address this issue. The inevitable discovery "exception" has been described as an exception to the exclusionary rule, which dictates that evidence obtained by virtue of illegal police activity must be suppressed at trial The exception provides that evidence that would have been obtained regardless of illegal police activity will not be suppressed because to do so would violate the underlying policy of the exclusionary rule-which is to place the police in a position that is neither better nor worse than it would have been absent the illegal activity. See Nix v. Williams,
T15 The court of appeals held that the inevitable discovery exception can be satisfied only by an "entirely independent, alternate, intervening, appreciably attenuated investigation aside from the tainted investigation." James,
116 We agree. In Nix, the United States Supreme Court described the distinction between the specific requirements of the independent source doctrine and the broader dictates of the policy underlying the inevitable discovery exception. See
The independent source doctrine teaches us that the interest of society in deterring unlawful police conduct and the public interest in having juries receive all probative evidence of a crime are properly balanced by putting the police in the same, not a worse, position than] they would have been in if no police error or misconduct had occurred.
Id. at 443,
T 17 In conclusion, we note that our decision of the issues presented on certiorari does not completely resolve this case. Before the court of appeals, James presented a third distinct ground for suppression of at least a portion of the evidence of his intoxication. Specifically, he argued that Kendrick and Hancock lacked the probable cause and exigent circumstances necessary to enter his garage without a warrant and arrest him. Because the court of appeals did not address this argument, see Reese v. Reese,
Notes
. At the suppression hearing, Kendrick indicated that he had some concerns for his safety due to the high profile of the truck, which prevented him from observing what was taking place in the cab of the truck below his line of vision.
. The detention "must be temporary and last no longer than is necessary to effectuate the purpose of the stop." Florida v. Royer,
. James asserts that the State has raised concerns relating to officer safety for the first time on appeal. This argument is misplaced. It is clear that the safety concerns guiding the Supreme Court's decision in Mimims do not depend on any particular showing that an officer was at heightened risk due to the unique circumstances of a given automobile stop, see, e.g., Knowles v. Iowa,
. Although the court of appeals did not address this issue at any length, we must necessarily dispose of it to reach the question presented on certiorari.
. In Kaysville City v. Mulcahy,
. The court of appeals noted that the evidence was not entirely clear on the question of whether Kendrick did or did not tap on the driver's window before opening the door. See James,
. In some circumstances, we have been willing to treat issues not addressed by the court of appeals for purposes of judicial economy. See, e.g., State v. Brooks,
