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Back when President Joe Biden was presiding over essentially open U.S. borders, I argued that contrary to leftist wishes, border walls actually do work. They are not intended to stop everyone coming through, by any means, but to stop illegal people, goods and drugs getting through easily.

Now the Department of Homeland Security is using "smart walls" that combine high-tech with good old-fashioned tall, strong barriers to prevent illegal entry. The idea is not new, even if the technology is.

The ancient Romans had an early version of smart walls. At Hadrian’s Wall in what is now northern England, the Roman empire established a wall to mark their northern frontier, punctuated by forts. Vindolanda is the best preserved larg

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