On October 3, 2019, OIP surreptitiously published a “step-by-step guide“ for adjudicating whether information is confidential for Exemption 4 purposes — that is, the guidance was not referenced in the FOIA Post on its home page. The Exemption 4 section of DOJ’s FOIA Guide references the Supreme Court’s decision in Argus Leader, but does not yet incorporate OIP’s latest guidance.