Background
Baltimore police investigating a shooting obtained an arrest warrant for Kerron Andrews and a pen-register order covering information associated with his cellphone. Provider data narrowed the phone’s location to several city blocks, after which detectives used a Hailstorm cell-site simulator to pinpoint it inside a particular townhome. With the resident’s consent, officers entered, found Andrews with the phone in his pocket, and later discovered a gun while executing a search warrant.
Police did not disclose their use of Hailstorm until about a year into Andrews’s criminal proceedings. Maryland courts suppressed the resulting evidence after concluding that using the simulator without a warrant violated the Fourth Amendment, and prosecutors dismissed the charges. Andrews then brought federal and state constitutional claims against the detectives, the Baltimore City Police Department, and its commissioner, seeking damages related to his nearly two years of pretrial detention. Following an earlier appeal and additional discovery, the district court granted the defendants summary judgment.
The Court’s Holding
The Fourth Circuit held that police use of a cell-site simulator to locate a cellphone constitutes a Fourth Amendment search. The technology directly induces nearby phones to connect, can produce location information more precise than provider-generated cell-site data, and in this case enabled police to determine that Andrews’s phone was inside a private residence. The court stated that the Fourth Amendment requires a valid warrant for such use, but it did not decide whether the pen-register order obtained here satisfied the warrant requirement.
The court nevertheless affirmed summary judgment for all defendants. Detectives Michael Spinnato and John Haley received qualified immunity because, in 2014, no controlling or sufficiently persuasive precedent clearly established that using a cell-site simulator was a Fourth Amendment search. They also received Maryland public-official immunity because the unsettled law and their reliance on the court order precluded a reasonable finding of malice or gross negligence. The municipal defendants were not liable under Monell because Andrews failed to produce evidence that a Baltimore Police Department policy, custom, or practice caused the violation; the nondisclosure agreement with the FBI, standing alone, was insufficient.
Key Takeaways
- Using a cell-site simulator to identify or track a cellphone’s real-time location is a Fourth Amendment search.
- The court did not decide whether the particular pen-register order qualified as a valid warrant because the detectives prevailed on qualified immunity.
- The FBI nondisclosure agreement did not establish Monell liability without evidence that Baltimore police implemented it through an unconstitutional policy or practice.
Why It Matters
The decision establishes within the Fourth Circuit that cell-site simulator surveillance implicates the Fourth Amendment, including when it supplies only a snapshot of a phone’s real-time location. Its emphasis on the technology’s ability to penetrate the privacy of a home and directly commandeer cellphone signals gives courts and law-enforcement agencies guidance for future investigations.
At the same time, the judgment illustrates the gap between recognizing a constitutional violation and obtaining civil damages. Because the governing law was not clearly established when the 2014 search occurred, the individual officers remained immune, and the absence of proof tying the violation to a municipal policy defeated liability against the police department.