"During fiscal year 2016, DHS reported spending approximately $1.2 billion in purchase, travel, and fleet card transactions. Although the Department has established internal controls for its charge card programs, the components we reviewed did not always follow DHS' procedures. Our testing results of purchase, travel, and fleet card transactions revealed internal control weaknesses. Specifically, we found major internal control weaknesses that persisted at the United States Coast Guard and some control weaknesses within CBP's [U.S. Customs and Border Patrol] Fleet Card Program. As a result, there is moderate risk that DHS' internal controls over its charge card programs may not prevent illegal, improper, or erroneous purchases and payments."
Department of Homeland Security, Office of Inspector General, Report No. OIG-18-57
U.S. Department of Homeland Security Office of Inspector General: https://www.oig.dhs.gov/