President Trump has inherited a vast domestic intelligence agency with extraordinary secret powers. A cache of documents offers a rare window into the FBI’s quiet expansion since 9/11. Confidential Human Source Policy Guide Detailed rules for how the FBI handles informants. Classified secret. This unreleased September 2015 document is a major expansion and update of a manual from 2007 on the same topic. The FBI Gives Itself Lots of Rope to Pull in Informants Trevor Aaronson Agents have the authority to aggressively investigate anyone they believe could be a valuable source for the bureau....