Why doesn’t the UK just have a open border between Ireland and Northern Ireland and the rest of the UK?

Stoner710

So obviously were talking about Brexit now as an American I don’t know much about EU rules
But unlike the border between the United States and Mexico there’s not much crime from what I understand coming in from Ireland to the UK so if there is a no Brexit deal why not just set up an open border with Ireland or that you can keep that relationship going and the people aren’t too much affected
Why doesn’t the UK just have a open border between Ireland and Northern Ireland and the rest of the UK?
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