Documents obtained by the ACLU have revealed that the U.S. Marshals Service has experimented with using drones for domestic surveillance.

The documents, available on the ACLU website, were released via a Freedom of Information Act request.

The rights group says that although the Marshals Service admitted it had found 30 pages of information pertaining to its use of drones, it only actual handed over two, which were heavily redacted, containing only two short paragraphs of visible information.

Under the heading “Unmanned Aerial Vehicle, Man-Portable (UAV) Program,” an agency document overview states:

“USMS Technical Operations Group’s UAV Program provides a highly portable, rapidly deployable overhead collection device that will provide a multi-role surveillance platform to assist in [redacted] detection of targets.”