from the collect-it-all dept
Years after they’ve become a go-to tool for law enforcement to work their way backwards to suspects, the Massachusetts Supreme Court is wrestling with the issue of cell tower dumps.
Cell tower dumps can often be had with only a subpoena. They give investigators access to all cell phones that were in the area of the tower at certain times. Investigators peruse these lists of numbers to try to find numbers that might be linked to someone who committed a crime. The problem is investigators don’t know who that “someone” is, so they, however briefly, turn everyone in the area into a suspect.
The Third Party Doctrine tends to control this collection of data. The information is collected as a necessary part of cell phone operation. Therefore, there’s no expectation of privacy in this information, the theory goes, since users are aware service providers need this information to provide service. And it very well may be that cell users are aware of this. What they generally don’t expect is that law enforcement can obtain this data without a warrant, or, indeed, obtain it at all when investigators don’t even know who they’re looking for.
The thorny issue of tower dumps is before the court, which now has the US Supreme Court’s Carpenter decision to consider as well, something it didn’t have prior to June 2018. In that decision, the Supreme Court says there was an expectation of privacy in cell site location data, which tower dumps are, even if they contain information on hundreds or thousands of people, rather than the more targeted collection of cell site location info related to a single targeted number.
The Carpenter decision was rather narrow, holding that use of cell site location info to track people’s movements requires a warrant. But it also stated clearly that there’s an expectation of privacy in these records, whether or not they’re collected long term or once via a tower dump. The tracking was the issue here, but Carpenter changed how courts view cell site location info.
The state of Massachusetts has its own constitution to factor in as well. And in some cases, state constitutions have proven more protective of rights than the US Constitution, which is considered to be the floor for rights, rat
