FOIA, Fees
Fees should be partially denied for FOIA proceedings that partially result in records already in the public domain only where the fees that resulted in public documents are segregable and whether the difficulties encountered militate against denial of fees.
https://www.cadc.uscourts.gov/internet/opinions.nsf/3D5B77098A5F717385257F41006AF4C8/$file/14-5230-1594919.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.