A bill (H.R. 4899) introduced by Rep. Jerrold Nadler (D-NY) would require that all cargo containers bound for the United States be scanned using the best-available technology—including radiation and density scanning—before they are loaded onto a ship. These scans would then be reviewed by U.S. security personnel before the container is loaded. Once scanned, the containers would be sealed with a device that would indicate whether the container has been tampered with in transit. Under the bill, this device would have to have the capability to notify officials if a breach has occurred before the container enters a U.S. port.