Periodic Acid Phenylhydrazine Schiff; Pre-Arrival Processing System(The Pre-Arrival Processing System (PAPS) is a U.S. Bureau of Customs and Border Protection border cargo release mechanism that utilizes barcode technology to expedite the release of commercial shipments while still processing each shipment through Border Cargo Selectivity (BCS) and the Automated Targeting System (ATS). 4uzhoj)