evidence: Under the Privacy Act’s disclosure provision, agencies generally are prohibited from disclosing records by any means of communication – written, oral, electronic, or mechanical – without the written consent of the individual, subject to twelve exceptions. [...] OMB guidelines suggest, and courts have generally approved of, written consent that states the general purposes for, or types of recipients to, which disclosures may be made; the scope of an agency’s permitted disclosures is then defined by the terms on which the individual provided written consent. [...] LEXIS 20334, at *6 n.6 (D.D.C. Dec. 5, 1983) (addressing alternative argument, stating: "It is not unreasonable to require that a written consent to disclosure address the issue of such disclosure and refer specifically to the records permitted to be disclosed.").