Yup, as a foreign national, I had to jump through a myriad of hoops to get a TWIC which enables to enter and exit US ports freely without someone escorting me around. Fun fact: A TWIC allows even foreigners to register as a known traveler, allowing me to skip a lot of the hazzle when flying in the US.

I am curious now on how much of it is about being worried about nuclear bomb, and how much is about people either knowingly importing illegally radioactive materials or worker forgetting that the big orange box is actually radioactive materials (believe me, it’s way more common than it seems, especially with low activity parts)