Thankfully it’s not as if some persons unknown could sneak across our borders and travel unimpeded across any place USA and cause a prob............. Oh. ;-)
Ya think?
A more ominous threat is a minor player in terrorism sneaking a nuclear device into Yellowstone and detonating it where the effect awakens that super volcano. A shipping container is large enough to accomplish the delivery and we have tens of thousands of semis criss crossing the nation regularly.