The self-proclaimed Islamic State has used National Security Agency documents stolen by former contractor Edward Snowden to evade U.S. intelligence services, officials told the New York Times in a Tuesday story. The Times reported that fact deep in a story on the group’s efforts to evade and recover from American and Iraqi military strikes. Documents stolen and leaked to reporters by Snowden, who remains in hiding in Russia, have led to changes in IS operations that have prevented U.S. forces from gathering intelligence on the group, the Times reported. The Islamic State has also studied revelations from Edward J. Snowden,...