On February 18, 2013, the Supreme Judicial Court issued a decision in Commonwealth v. Augustine. In the decision, the court ruled that the Commonwealth must obtain a warrant supported by probable cause before getting cell site location information (CSLI) associated with a particular cellular telephone from cellular telephone providers. CSLI records include information about a subscriber’s location when using the cellular telephone, and therefore can be used to reconstruct the subscriber’s movements and location over time.
The underlying facts of the case are as follows: The victim was murdered in 2004. During the course of the criminal investigation, the police began to focus on Augustine, who had previously dated the victim. As part of the investigation, the police sought certain records from Augustine’s cellular phone provider (Sprint), including CSLI information that spanned two weeks, beginning on the date of the victim’s disappearance, August 24, 2004.
The Commonwealth applied for the records under a federal statute – 18 U.S.C. § 2703 – which governs the compelled disclosure of customer communications and records to law enforcement. The statute requires that law enforcement demonstrate “specific and articulable facts showing that there are reasonable grounds to believe that the . . . records or other information sought, are relevant and material to an ongoing criminal investigation.” The Commonwealth’s application for Augustine’s records was supported by an affidavit from one of the state troopers involved in the murder investigation. The affidavit stated that the police sought the records to determine the “general location” of Augustine and the victim at the time of the victim’s disappearance, and to potentially include or exclude Augustine as a suspect in the murder. A Superior Court judge allowed the Commonwealth’s application. An order compelling the production of the records was sent to Sprint and the CSLI records were subsequently provided to the Commonwealth. Augustine was charged with the victim’s murder 7 years later, in 2011.
During the course of the court case, Augustine filed a motion to suppress evidence of the CSLI on the ground he had a “reasonable expectation of privacy” in the records, and therefore the police were required to get a valid search warrant based on probable cause before obtaining the records (probable cause is a higher standard of proof than the “specific and articulable facts” required by 18 U.S.C. § 2703). A reasonable expectation of privacy exists if (1) a person subjectively expects privacy; and (2) the expectation is one that society as a whole would think is legitimate. Under both the Federal and Massachusetts Constitutions, a search in the constitutional sense occurs when the government’s conduct intrudes on a person’s reasonable expectation of privacy.
Augustine argued that because he had a reasonable expectation of privacy, and because the police failed to get a warrant supported by probable cause, his constitutional rights were violated, and therefore the Commonwealth should not be able to use the CSLI records against him at trial. The Commonwealth argued that there was no search in the constitutional sense because the CSLI records were business records of Augustine’s cellular served provider and therefore Augustine did not have a reasonable expectation of privacy in them. Continue reading →