字幕列表 影片播放 列印英文字幕 (light music) - [Narrator] You're probably aware that different apps on your cellphone can track your movements. That location data is commercially available along with other personal information like your social media profile, email address, and date of birth. But what the Wall Street Journal has learned is that the government has also bought a commercial data and is using it for some forms of law enforcement. - Two components of the Department of Homeland Security are using this app-generated marketing data for law enforcement purposes. The fact that there're millions of cellphones and cellphone locations in this database makes it one of the larger domestic surveillance efforts that we've become aware of in recent years. It raises a lot of questions among the Americans about their privacy and what kind of information corporations are collecting on them, and what those corporations are doing with that information. (light music) - [Narrator] This is how it works. You get this popup and agree to let an app use your location. A travel app may want it to suggest nearby hotels or airports. Rideshare apps want to know where to pick you up. But often those apps are also sharing your location with marketers who're using it for targeted ads, research, analysis and even reselling it. But what we found is that, in some cases, that consumer data is being resold to companies that buy and sell data for the government. According to people familiar with the matter and documents reviewed by the Wall Street Journal, the Trump administration has purchased the database that maps the movements of millions of cellphones in the U.S., and it's using it for immigration and border enforcement. (light music) In 2018, data tracking contributed to the discovery of a drug-smuggling tunnel according to people with knowledge of the operation. - Sources describe this one case down in Arizona, a border town called, San Luis, where a man had allegedly built a tunnel between his property, which was an abandoned KFC restaurant, and the Mexican border. Police say that smugglers were using this tunnel, but the interesting thing is, when this person was arrested, none of the court records indicate that they found this tunnel based on cell records. This data was showing cellphone's moving from one side of the border to the other and investigator surmised there must be an illegal tunnel there and began further investigation that led the arrest of this person. - [Narrator] In a statement to the Wall Street Journal, a CBP spokesman said, "While CBP is being provided access to location information, "it is important to note that such information "does not include cellular phone tower data, "is not ingested in bulk, "and does not include the individual user's identity." The government would not discuss details about how it is using the data. But people familiar with some of the government efforts say it is used to generate investigative leads about possible illegal border crossings, and for detection or tracking of migrant groups. The government's location data efforts are also described opaquely in the U.S. Department of Homeland Security's Privacy Assessment. One reads, "The goal is to utilize this data "to detect the presence of - but not identify - "individuals in an area which CBP has identified "as an area of interest, "consistent with CBP statutory authorities, "federal law, and DHS policy." (upbeat music) - [Woman's Voice] Your average consumer looks at their phone over 150 times a day. - [Narrator] The marketing technology ecosystem has taken off in recent years. (upbeat music) - [Man's Voice] Marketers create audiences based on rich device-level attributes including location, platform, device type and app (mumbles). All this data has built on what more than 250 million mobile consumers do in real life. Every day, - [Narrator] It's big business and there are many companies collecting all sorts of different data, anything from the speed to a traveling, to what floor you're on, to your social media profiles. Some companies known as data brokers buy different sets of these data and combine them to create even more sophisticated individual digital profiles while the privacy policies of these companies say they do not keep personal information and explain that, to them, you were just a few letters or numbers known as an Ad-ID. Experts we spoke to say that, by using large data sets, it's easy to figure out who a phone belongs to, which is one of the reasons why this data is so valuable to the government. - The location data is some of the most sensitive data that exists. - [Narrator] Alan Butler is the general counsel of the Electronic Privacy Information Center, a nonprofit research and advocacy center based in D.C.. - There are a number of different ways that a company that obtains these data sets could identify a person. One way might be by mapping the locations over time because people live in operative patterns, the companies are more concerned with discrete connections. They wanna tie everything together in an automated way. And the easiest way for them to do that is by using identifiers, the Ad-ID, which is gonna connect the dots, all the dots of them will add data, but also email addresses, Facebook profiles, or Twitter profiles, or other sort of app profile data. And so, the more data those companies can get about you, the more they can connect it. (light music) - [Narrator] If the government wanted to get that kind of data from your cellphone provider, they have to get a warrant from a judge. But because this data is for sale, for marketers, they are able to buy it and access it without a warrant. - Most recently, the Supreme Court in the Carpenter versus United States case restricted the government's ability to use a court order to get commercial data from the phone company, which is the data about where your phone is connecting on the cellphone network. The Supreme Court has not directly addressed the purchasing of commercial data, the federal law doesn't impose restrictions and the circumstance under which the federal government can collect personal data under the Privacy Act, but that also can be tricky if the company never actually stores the data in a government database. - [Narrator] Recently, some companies have taken steps to alert users about location data. - This market advertising data on smartphones is barely 10 years old and already we're seeing that consumers are taking more control over their privacy in ways that could've hurt this industry. Apple and its latest update made it so that it reminded users how often apps are tracking them. And some industry insiders have said that the amount of location data has plummeted since Apple made that change. Users are becoming broadly much more aware of how their phones are tracking them and taking steps to limit what kind of apps have accessed to their location. - [Narrator] Critics argue that if companies have this data, then why shouldn't the government also have access to it for crime prevention.