What does de novo review mean in a FOIA lawsuit, and why does the agency carry the burden of proof?

When a federal agency withholds records and a requester sues under the Freedom of Information Act (FOIA), the case reaches a court. Two related ideas shape how that case is decided: de novo review and the burden of proof. Together they tilt the playing field toward disclosure, which is the law’s basic purpose.

What “de novo” review means

“De novo” is Latin for “anew” or “from the beginning.” In a FOIA lawsuit, it means the court does not simply defer to the agency’s earlier decision to withhold. Instead, the judge looks at the question fresh and decides for itself whether the records were properly withheld.

This is different from many other areas of administrative law, where courts give agencies wide deference and overturn a decision only if it was unreasonable. Under FOIA, the agency’s prior denial gets no such presumption of correctness. The court independently evaluates whether each claimed exemption actually applies to the records at issue.

Why the agency carries the burden of proof

In most lawsuits, the party who files (the plaintiff) must prove their case. FOIA flips this. Because the statute presumes records are open to the public, the agency — not the requester — must justify any withholding.

That means the agency has to show:

• The records fall within one of FOIA’s specific exemptions, and
• It conducted an adequate search and released all reasonably segregable non-exempt material.

Agencies typically meet this burden by submitting detailed declarations or an index describing each withheld document and the exemption claimed, so the court can test the justification.

Why this design matters

Placing the burden on the government reflects FOIA’s core principle: openness is the default, and secrecy is the exception that must be earned. A requester does not have to prove they are entitled to the records; the agency must prove why the public should not see them.

A few practical notes:

• Federal agencies generally have 20 business days to respond to a request, though litigation arises only after the administrative process plays out.
• These rules govern the federal FOIA. State public-records laws vary, and their standards of review and burdens may differ.

To explore related concepts, see our FOIA and public records topic page.