When a cellphone is reported stolen in New York, the Police Department routinely subpoenas the phone’s call records, from the day of the theft onward. The logic is simple: If a thief uses the phone, a list of incoming and outgoing calls could lead to the suspect.
But in the process, the Police Department has quietly amassed a trove of telephone logs, all obtained without a court order, that could conceivably be used for any investigative purpose.
The call records from the stolen cellphones are integrated into a database known as the Enterprise Case Management System, according to Police Department documents from the detective bureau. Each phone number is hyperlinked, enabling detectives to cross-reference it against phone numbers in other files.
NYC Police Amassing Trove of Cellphone Logs | DFI News.