State of Iowa v. Yale Stevens, 970 N.W.2d 598

Shortly after midnight officers stopped an Audi that had left a location an officer described as a suspected drug house; driver Kyle Stevens and rear passenger Yale Stevens were detained.
K‑9 officer Simons brought Aura, a passive drug dog, to sniff the vehicle; Aura alerted (sat) at the driver’s door, entered the vehicle twice, and showed interest in the passenger side inside the car but did not alert there.
Sergeant Clausen, after removing Yale from the car and patting him down for weapons (finding only innocuous items), told Yale he would search him; Yale mumbled and reached toward his coat pocket.
Clausen reached into Yale’s pocket and seized a bag that field‑tested positive for methamphetamine; a similar quantity was later found on Kyle.
Yale moved to suppress, arguing the dog’s alert on the vehicle did not give probable cause to search his person; the district court denied suppression, convicted Yale, and the Iowa Supreme Court granted review.
The Iowa Supreme Court reversed, holding the dog alert on the vehicle alone did not provide probable cause particularized to Yale to search his person.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether a drug‑dog alert on a vehicle supplies probable cause to search a passenger’s person	Dog alert on the car + car left a known drug house + Yale’s mumbling supplied probable cause to search him	Dog alerted only at driver’s door; no facts particularize suspicion to Yale; mumbling insufficient	Reversed — a dog alert on the vehicle alone does not create probable cause to search a passenger; need particularized facts linking person to crime
Whether officers had probable cause to arrest/search Yale contemporaneously (search‑incident rationale)	Search incident to a lawful arrest is permissible if probable cause to arrest existed at time of search	There was no probable cause particularized to Yale to support an arrest, so no valid contemporaneous search	Held that officers lacked probable cause to arrest Yale before searching his pocket, so search incident to arrest was invalid

Maryland v. Pringle, 540 U.S. 366 (probable cause must be particularized to the person to be arrested)
United States v. Di Re, 332 U.S. 581 (presence in a suspected car alone does not justify a personal search)
Ybarra v. Illinois, 444 U.S. 85 (search or seizure must be supported by probable cause particularized to the person)
Wyoming v. Houghton, 526 U.S. 295 (automobile exception can justify searching containers in vehicle but distinguishes searches of persons)
State v. Horton, 625 N.W.2d 362 (Iowa) (probable cause to search vehicle does not automatically justify search/arrest of passenger)
State v. Bergmann, 633 N.W.2d 328 (Iowa) (reliable drug‑dog alert can establish probable cause to search a vehicle)
Brinegar v. United States, 338 U.S. 160 (probable cause protects against unfounded intrusions; standard explained)
Illinois v. Gates, 462 U.S. 213 (totality‑of‑circumstances test for probable cause)
Arizona v. Gant, 556 U.S. 332 (limits on searches incident to arrest of vehicles)
United States v. Robinson, 414 U.S. 218 (search incident to lawful custodial arrest justified to disarm suspect and preserve evidence)