CBP's ACAS Program Did Not Always Prevent Air Carriers from Transporting High-Risk Cargo into the United States [open pdf - 1MB]
From the Document: "Air cargo shipments pose significant threats to national security. CBP [U.S. Customs and Border Protection] and TSA established the ACAS [Air Cargo Advance Screening] Program with the goal of identifying and preventing high-risk cargo from entering the United States. We conducted this audit to determine to what extent the ACAS program prevents air carriers from transporting high-risk cargo from foreign airports into the United States."
Department of Homeland Security, Office of Inspector General Report No. OIG-20-34
Department of Homeland Security Office of Inspector General: https://www.oig.dhs.gov/