Aircraft in the program out outfitted with "dirtbox" devices produced by Boeing that are designed to mimic cellular towers, fooling cellphones into reporting "unique registration information" to track down "individuals under investigation." According to the WSJ, these devices let investigators gather "identifying information and general location" data from thousands of cellular phones in one flight, and Apple's encryption policies don't prevent the collection of data.
Cellphones are programmed to connect automatically to the strongest cell tower signal. The device being used by the U.S. Marshals Service identifies itself as having the closest, strongest signal, even though it doesn't, and forces all the phones that can detect its signal to send in their unique registration information. Even having encryption on one's phone, such as Apple Co. 's iPhone 6 now includes, doesn't prevent this process.The fake tower devices are able to interrupt calls on "certain phones," with authorities attempting to minimize harm by ensuring they doesn't interrupt emergency calls, and the technology can pinpoint a suspect's cellphone location down to three meters.
The technology is aimed at locating cellphones linked to individuals under investigation by the government, including fugitives and drug dealers, but it collects information on cellphones belonging to people who aren't criminal suspects, these people said. They said the device determines which phones belong to suspects and "lets go" of the non-suspect phones.
The program is run by the U.S. Marshals Service, and some individuals involved have raised concerns about the legality of the operation and "if there are effective procedures" in place to safeguard the handling of data acquired, as it is said to capture data from thousands of non-criminal individuals as well.
It is not known how often the flights take place as the WSJ's sources did not divulge that information, but they reportedly "take place on a regular basis." Justice Department officials did not confirm or deny the existence of the program when questioned, stating that a discussion of the matter could "allow criminal suspects or foreign powers to determine U.S. surveillance capabilities," but a representative said that Justice Department agencies comply with federal law and seek court approval for their activities.
A Verizon spokesperson said that the company was not aware of such a program and did not participate, while spokespeople from AT&T and Sprint declined to comment.
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