The document discusses various transportation security laws and regulations passed after 9/11. It provides an overview of key laws such as the Aviation and Transportation Security Act, which created the Transportation Security Administration (TSA), and the Maritime Transportation Security Act, which enhanced port security. It also discusses international treaties and standards regarding aviation, cargo, rail, maritime, and hazardous materials transportation security. While significant progress has been made in strengthening domestic transportation security laws, the document concludes that more still needs to be done to standardize security practices across all modes of transportation.