GOLDEN, Justice.
[¶ 1] In this case, this Court granted the State’s petition for writ of review to determine the narrow question whether the district court transgressed the holding in Maryland v. Dyson, 527 U.S. 465, 467, 119 S.Ct. 2013, 2014, 144 L.Ed.2d 442 (1999) (per curiam), when the district court granted the defendant’s motion to suppress incriminating evidence seized by law enforcement officers during a lawful traffic stop which led to charges that the defendant, the driver of the stopped vehicle, possessed three or more grams of methamphetamine and a quantity of marijuana in violation of state law.
[¶ 2] We hold that the district court erred as a matter of law in granting the defendant’s motion to suppress on the mistaken understanding that the automobile exception to the search warrant requirement has a separate exigency requirement. In Dyson, the United States Supreme Court reaffirmed its previous holdings1 that
the automobile exception [to the search warrant requirement] does not have a separate exigency requirement:
“If a car is readily mobile and probable cause exists to believe it contains contraband, the Fourth Amendment ... permits police to search the vehicle without more.”
Dyson, 527 U.S. at 467,119 S.Ct. at 2014.
[IT 3] In its petition for writ of review, the State presented these questions:
• Was there probable cause sufficient to justify the trooper’s search of the automobile drive by [Williams]?
• Prior to conducting a search of the interior of the vehicle and any closed containers, was the officer obligated to obtain a search warrant?
In its appellate brief, the State has reiterated these issues and added one more:
Did [Williams] fail to adequately preserve the issue of independent state constitutional analysis?
While Williams in her appellate brief has phrased the issues somewhat differently than the State, the issues are essentially the same as the State’s.2
FACTS
[¶4] Around 5:00 p.m., Wednesday, September 26, 2001, Wyoming State Trooper Kelly Broad and his drug detection dog, Joey, were patrolling Interstate Highway 90 south of Sheridan in Sheridan County, Wyoming. Trooper Broad and his dog, Joey, had worked together as a canine unit since August of 2000. They had received training in drug detection, trained together on a near daily basis, and had been certified by the California Narcotics Canine Association. The dog, Joey, had been trained to identify marijuana, heroin, methamphetamine, and cocaine. Trooper Broad regularly performs “proofing” exercises that are used to reasonably assure that his dog alerts only to the designated controlled substances. There had been no “proofing” issues with his dog around the time in question in this case. As Trooper Broad traveled eastbound on the highway, he saw a 1988 maroon-colored Pontiac Bonneville without a front license plate traveling westbound on the highway. When the Pontiac passed Trooper Broad, he saw that it displayed a Wyoming license plate on the rear bumper. Wyoming law requires vehicles registered in Wyoming to display front and rear license plates. Wyo. Stat. Ann. § 31-2-205(a) (LexisNexis 2003). Trooper Broad crossed the highway median and stopped the Pontiac.
[¶ 5] In the Pontiac, Trooper Broad saw a female driver, a male passenger, and a large dog. Trooper Broad asked the driver of the Pontiac for her driver’s license, registration, and proof of insurance. The driver handed Trooper Broad a South Dakota identification card, which identified her to be Carol
1
Pennsylvania v. Labron, 518 U.S. 938, 940, 116 S.Ct. 2485, 2487, 135 L.Ed.2d 1031 (1996) (per curiam); United States v. Ross, 456 U.S. 798, 809, 102 S.Ct. 2157, 2164-65, 72 L.Ed.2d 572 (1982).
2
• Whether probable cause existed to justify searching [Williams’] car after a citation had been issued? 2. Whether the illegal search violated the Wyoming State Constitution?