People v. Carter, 2021 IL 125954

March 2016: anonymous 911 caller reported a white male in a black hoodie "swinging at" two white females and carrying a gun; initial location given, then updated to a spot two blocks away.
Officer Luzadder arrived minutes later, saw defendant matching the description walking in an alley with his right hand on his waistband; no women or assault observed.
Luzadder ordered defendant to the squad car, conducted a protective pat‑down, felt a handgun, recovered a nickel‑plated revolver, and arrested defendant. Defendant made an incriminating statement after arrest.
Defendant was charged with armed habitual criminal (AHC) based on prior armed robbery and aggravated battery convictions, plus other weapons offenses; he moved to suppress the gun and statement arguing the stop lacked reasonable suspicion.
Trial court denied suppression; after a bench trial defendant was convicted and sentenced to nine years on AHC; the appellate court affirmed both suppression and conviction; the Illinois Supreme Court granted review.

Issue	State's Argument	Carter's Argument	Held
1. Was the investigatory stop supported by reasonable, articulable suspicion under Terry?	911 anonymous tip plus officer corroboration (matching description, contemporaneous location updates, officer’s observation that defendant was concealing a gun by holding his waistband) created reasonable suspicion.	Tip was anonymous and not adequately reliable; police did not observe the assault, the women, or a gun; holding one’s waistband is innocuous and did not sufficiently corroborate the tip.	Yes. Court affirmed suppression denial: totality of circumstances (911 call with eyewitness, quick updates, officer corroboration by location/behavior) gave reasonable suspicion for a Terry stop and protective pat‑down.
2. Was the evidence sufficient to convict Carter of armed habitual criminal (AHC) based on two qualifying prior felonies?	The State treated both prior convictions as qualifying; appellate court deferred to trial record.	The State failed to prove the aggravated battery prior conviction was a qualifying forcible felony (no proof it resulted in great bodily harm/permanent disability or disfigurement).	No. Supreme Court accepted the State’s concession that the record lacked proof the aggravated battery was a qualifying predicate, reversed the AHC conviction and remanded for resentencing (other counts had been merged).

Terry v. Ohio, 392 U.S. 1 (1968) (established stop‑and‑frisk standard: investigatory stop requires reasonable, articulable suspicion)
Florida v. J.L., 529 U.S. 266 (2000) (anonymous tip of gun possession without predictive information insufficient for Terry stop)
Prado Navarette v. California, 572 U.S. 393 (2014) (contemporaneous 911 calls reporting eyewitness criminal activity carry indicia of reliability warranting lower corroboration requirement)
United States v. Cortez, 449 U.S. 411 (1981) (totality‑of‑the‑circumstances approach to reasonable suspicion)
United States v. Sokolow, 490 U.S. 1 (1989) (innocent conduct may warrant suspicion when taken together with other facts)
People v. Lampitok, 207 Ill. 2d 231 (2003) (factors for assessing reliability of tips and need for corroboration)
United States v. Simmons, 560 F.3d 98 (2d Cir. 2009) (distinguishing J.L. where anonymous 911 report of an ongoing assault reduced the corroboration required)
United States v. Hicks, 531 F.3d 555 (7th Cir. 2008) (distinguishing J.L. for tips reporting active threats/emergencies)