The U.S. Drug Enforcement Administration’s logging of international phone calls made from the U.S. was illegal, advocacy group Human Rights Watch has alleged in a lawsuit filed late Tuesday.

The DEA and the U.S. Department of Justice ran the secret snooping program for decades without judicial oversight, logging “virtually all telephone calls” from the U.S. to as many as 116 countries linked to drug trafficking, according to a USA Today report. The program did not record the content of the calls and was used to fight drug trafficking.

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