In the Int. of: A.A., a Minor Appeal of: A.A., 195 A.3d 896

On Jan. 9, 2015, Sgt. Christopher Still stopped A.A.’s vehicle for expired registration; A.A. was the 17-year-old driver and Kyle Lewis a passenger.
During the stop Still observed A.A. appearing confused/sluggish, Lewis making furtive movements and briefly opening the passenger door, and he detected an odor of marijuana.
Still returned to his patrol car to prepare paperwork, then issued a citation and told A.A. she was free to go and "good night." He shortly thereafter re‑engaged the occupants, asked to search the car, and obtained consent.
During the subsequent search officers found a pill, marijuana residue and paraphernalia; Lewis was found with a BB gun and was handcuffed; field sobriety tests led to A.A.’s arrest.
A.A. moved to suppress evidence, arguing the re‑engagement constituted a second investigative detention unsupported by reasonable suspicion; trial court and Superior Court (relying on Kemp) denied suppression; this Court granted review.

Issue	Plaintiff's Argument (A.A.)	Defendant's Argument (Commonwealth)	Held
Whether facts lawfully observed during an initial traffic stop may be used to justify a re‑engagement after the officer says the motorist is free to go, making consent valid	Re‑engagement was a second, separate investigative detention; the officer needed new reasonable suspicion based on facts arising after the stop (Nguyen approach); consent was therefore tainted	The court should apply a totality‑of‑the‑circumstances test (Kemp): all facts known to the officer—including those from the initial stop—may be considered to justify continued detention and validate consent	Held: under the facts here the officer had reasonable suspicion based on observations from the initial stop; consent was valid and suppression was not warranted; Kemp’s totality approach is affirmed and Nguyen is disapproved to the extent it forbids use of facts from the initial stop
Whether Nguyen conflicts with Kemp and which rule controls	Nguyen prohibits using information learned during the first stop to justify a second detention	Kemp (en banc) permits consideration of all facts known to the officer; barring Nguyen would unduly punish prudent police and ignore the totality test	Held: Kemp’s approach is consistent with Freeman and Rodriguez; Nguyen is erroneous to the extent it bars consideration of facts learned during the initial stop

Rodriguez v. United States, 135 S. Ct. 1609 (U.S. 2015) (traffic stop cannot be prolonged absent reasonable suspicion)
Freeman v. Commonwealth, 757 A.2d 903 (Pa. 2000) (second detention requires reasonable suspicion independent of initial stop; suppression required where no additional facts existed)
Commonwealth v. Kemp, 961 A.2d 1247 (Pa. Super. 2008) (en banc) (totality test allows consideration of facts learned during initial stop to support continued detention)
Commonwealth v. Nguyen, 116 A.3d 657 (Pa. Super. 2015) (panel held facts from initial stop cannot justify a second detention)
Commonwealth v. Rogers, 849 A.2d 1185 (Pa. 2004) (articulates totality‑of‑circumstances standard for reasonable suspicion)