evidence: Prosecution team members should exercise caution when using e-communications with non-law enforcement witnesses. Individuals not on the prosecution team, including victims, lay witnesses, and outside experts, should be informed that e-communications are a written record that may be disclosed to the defense and that appropriate care should be exercised. [...] Prosecution team members should preserve for later review and possible disclosure all substantive e-communications created or received by team members during the course of an investigation and prosecution, and all e-communications sent to or received from lay witnesses, regardless of content. [...] For background and additional guidance on these matters, see the March 30, 2011, Deputy Attorney General Cole memorandum, Guidance on the Use, Preservation, and Disclosure of Electronic Communications in Federal Criminal Cases.* *Note that the discussion of personal use of social media in Deputy Attorney General Cole's 2011 memorandum has been superseded by JM 1-9.000 (Personal Use of Social Media).