A very interesing article you should read:
The United States and Panama signed a Declaration of Principles to help prevent smuggling of nuclear and other radioactive material.
"Securing global trade is a major priority for CBP, so I am pleased to be partnering with Panama and the Megaports Initiative," said CBP Commissioner W. Ralph Basham. "We are committed to using high-tech equipment and smarter, more secure containers to safeguard the supply chain, but realize that cooperation from our friends around the globe is our most potent weapon."
Read the full article at:
U.S., Panama Agree to Combat Nuclear Smuggling - Government Technology