FOIA Vaughn Index
An itemized index that a federal agency must prepare in FOIA litigation, describing each withheld document or redaction and specifying the exemption claimed for it, so a court can evaluate the withholding without requiring the agency to disclose the very material at issue.
FOIA litigation presents an inherent asymmetry: the agency knows exactly what it is withholding and why, while the requester and, in principle, the court cannot see the withheld material to evaluate whether the claimed exemption genuinely applies. The index resolves that asymmetry by requiring the agency to describe each withheld record and the specific exemption relied upon in enough detail for the court to assess the claim without compelling disclosure of the underlying content.
A typical index identifies each responsive document or redacted portion, the exemption or exemptions claimed, and a non-revealing description of the withheld material's nature and the reason disclosure would cause the harm the exemption is meant to prevent. Courts can supplement the index with in camera review of the actual documents when the index alone leaves a genuine dispute about whether an exemption applies, giving the requester's counsel a meaningful opportunity to challenge specific withholdings even without direct access to the material.
A Juricratic simulation of FOIA litigation can model index quality as a distinct dial from the strength of the underlying exemption claims — a matter with strong substantive exemption arguments can still face a higher projected likelihood of an adverse ruling if the agency's index is too generic or conclusory to support meaningful judicial review.
How it actually shows up
Requester's counsel challenging a FOIA denial scrutinizes the agency's index line by line, looking for withholdings described too generically to support the claimed exemption, and frequently requests in camera review or a more detailed index for specific disputed entries rather than accepting the agency's blanket characterization.
- Why can't a court just look at the withheld documents directly instead of requiring an index?
- Courts can and sometimes do conduct in camera review, but an index lets the requester's counsel meaningfully participate in challenging the withholding, which pure in camera review by the court alone would not allow.
- What happens if an agency's index descriptions are too vague?
- A court can find the index inadequate to support summary judgment for the agency and require a more detailed index, additional justification, or in camera review of the disputed material.
- Is a Vaughn index required in every FOIA case?
- It is a standard tool in contested FOIA litigation over specific withholdings, though its exact form and necessity can vary depending on the number of documents at issue and how the case is litigated.
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