Freedom of Information Act: DHS Needs to Reduce Backlogged Requests and Eliminate Duplicate Processing, Statement of Vijay A. D'Souza Director, Information Technology and Cybersecurity, Testimony Before the Subcommittee on Oversight, Management and Accountability, Committee on Homeland Security, House of Representatives [open pdf - 768KB]
From the Highlights: "FOIA [Freedom of Information Act] requires federal agencies to provide the public with access to government records and information based on the principles of openness and accountability in government. Each year, individuals and entities file hundreds of thousands of FOIA requests. DHS continues to receive and process the largest number of FOIA requests of any federal department or agency. For fiscal year 2018, over 40 percent of federal FOIA requests (about 396,000) belonged to DHS. GAO [Government Accountability Office] was asked to summarize its November 2014 and June 2018 reports which addressed, among other things, (1) DHS's methods to reduce backlogged FOIA requests and (2) duplication in DHS's processing of FOIA requests."
Government Accountability Office: https://www.gao.gov/