Prince Jones v. United States, 168 A.3d 703

Background

Two sexual assaults/robberies occurred in October 2013; both victims (escorts) received calls from the same number. Police obtained call records and real-time provider location data narrowing the search to the Minnesota Avenue area.
MPD Technical Services Unit (TSU) deployed a single cell-site simulator ("stingray") in the area to locate a target phone; officers located a parked car containing Prince Jones and Nora Williams and arrested Jones. Police recovered phones, a folding knife, and Jones made an inculpatory statement; Williams later testified for the government after immunity.
At the suppression hearing the trial court did not decide whether the simulator use was a Fourth Amendment search but denied suppression under the inevitable-discovery doctrine and found the government failed to prove it had not tracked Jones’s phone (government conceded standing at trial).
The D.C. Court of Appeals held the warrantless use of the cell-site simulator to locate Jones’s phone was a Fourth Amendment search and, absent a warrant or a recognized exception, unlawful; it rejected the government’s inevitable-discovery and good-faith arguments and reversed Jones’s convictions because the admission of tainted evidence was not harmless.
The court excluded multiple items as fruits of the unlawful search (Jones’s statement at arrest, phones recovered from Williams’s purse, phones/data from the car, warrant-based extractions premised on the illegal locate), and held that the inevitable-discovery and Leon/Davis good-faith exceptions did not validate the warrantless simulator use.

Issues

Issue	Plaintiff's Argument	Defendant's Argument	Held
Was warrantless use of a cell-site simulator a Fourth Amendment search?	Jones: yes — the simulator actively induced the phone to reveal identifying/location data and invaded reasonable privacy expectations.	Government: no — phones constantly broadcast signals; no reasonable expectation of location privacy in public.	Held: Yes. Using a simulator to locate a phone is a search because it exploits device behavior to discover precise location information that society recognizes as private.
Was the search lawful without a warrant due to exigent circumstances?	Jones: no exigency; ample time existed to obtain a warrant.	Govt: TSU believed exigent circumstances existed and relied on real-time provider data.	Held: Trial court rejected exigency; appellate opinion treats exigency as unproven and not a basis to validate warrantless simulator use.
Does the inevitable-discovery doctrine bar suppression?	Jones: no — lawful process to locate (targeting complainants’ phones) had not commenced because MPD had only one working simulator and it was used on Jones’s phone.	Govt: they had begun lawful steps (provider CSLI) and phones were together so lawful discovery was inevitable.	Held: No. The court requires the lawful process to have actually commenced before the illegality and a ‘‘requisite actuality’’ of discovery; here the lawful simulator search never began.
Does the Leon/Davis good-faith exception apply?	Jones: officers could not reasonably rely on legality given secrecy and lack of precedent; subsequent warrants were tainted.	Govt: officers acted in good faith; no clear precedent forbade simulator use at the time.	Held: No. Good-faith exception does not apply to secret, nonjudicial technology use absent objectively reasonable reliance on warrant, statute, or binding precedent; later warrants based on tainted info do not cure the illegality.
Were items and testimony fruit of the poisonous tree?	Jones: many items (knife, statements, phones, data, Williams’s testimony/photo) flowed from the illegal locate and should be excluded.	Govt: some items (booking statement, Williams’s testimony, phones from her purse) were admissible or attenuated.	Held: Many immediate fruits (Jones’s statement, phones from Williams’s purse, car phones/data, extracted data, photo) were tainted and should have been excluded; court saved only certain non-fruits (e.g., provider CSLI) and declined to apply attenuation to most challenged items.

Key Cases Cited

Katz v. United States, 389 U.S. 347 (establishes subjective and objective expectation-of-privacy test)
Kyllo v. United States, 533 U.S. 27 (police use of technology to obtain private information implicates Fourth Amendment and means matter)
United States v. Jones, 565 U.S. 400 (GPS monitoring and concurring views on location privacy)
United States v. Knotts, 460 U.S. 276 (beeper tracking in public spaces and limits of prior-device precedent)
United States v. Karo, 468 U.S. 705 (tracking that reveals in-home movements implicates Fourth Amendment)
Nix v. Williams, 467 U.S. 431 (inevitable-discovery doctrine articulated)
United States v. Leon, 468 U.S. 897 (good-faith exception to exclusionary rule)
Davis v. United States, 564 U.S. 229 (limits of good-faith reliance on precedent)
Herring v. United States, 555 U.S. 135 (exclusionary rule deterrence rationale)
Riley v. California, 573 U.S. 373 (warrant requirement for content on cell phones)
Wong Sun v. United States, 371 U.S. 471 (fruit-of-the-poisonous-tree framework)
Chapman v. California, 386 U.S. 18 (harmless-error standard)