Since FY 2014, DHS improved conference spending reporting and implemented policies and procedures to ensure proper oversight and accurate and timely reporting. However, we found instances where DHS did not comply with annual conference reporting requirements. The Department failed to report two conferences costing more than $100,000 each. The Department also did not always report all hosted conferences costing more than $20,000 to OIG within 15 days of the conclusion of each conference. In addition, the Department did not always properly record actual costs accurately and within 45 days of the conclusion of each conference. Although DHS did not always comply with reporting requirements, in most cases, its FY 2016 conference expenses appeared appropriate, reasonable, and necessary.