Homeland Security allegedly using serial killer as informant

From the Guardian, via Glenn Greenwald: ICE, the drug enforcement arm of DHS, is currently employing an informant who has committed several brutal murders. He murders while wearing a wire, so ICE agents listen in on the murders. At least one of the murders was a case of mistaken identity. ICE initally reported this to the Justice Dept, who instructed them to continue using the murderer. Permission was given on the say-so of high Justice Dept officals, many having close ties to Alberto Gonzalez and George Bush.