Documents obtained by the American Civil Liberties Union reveal the FBI took over and operated 23 child pornography websites out of a government facility in an attempt to catch site users. Though it was previously known the FBI operated one such site for 13 days before closing it down, using the website to install tracking malware on visitors' computers, the new documents show the scale of the project was much larger, comprising about half of all dark web child pornography sites. More than 100 child pornography cases have been prosecuted in connection to the first site the FBI was known to operate, and in several of those trials judges have deemed evidence collected in this manner inadmissible.

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