Newly released documents show U.S. immigration authorities have used a secretive cell phone snooping technology hundreds of times across the U.S. in the past three years.

The documents, obtained through a public records lawsuit by the American Civil Liberties Union and seen by TechCrunch, show that U.S. Immigration and Customs Enforcement (ICE) deployed cell site simulators — known as stingrays — at least 466 times between 2017 and 2019, which led to dozens of arrests and apprehensions. Previously obtained figures showed ICE used stingrays over 1,885 times over a four year period between 2013 and 2017.

The documents say that stingrays were not deployed for civil immigration investigations, like removals or deportations.

Although the numbers offer a rare insight into how often ICE uses this

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