Scottish independence: Here's the truth about borders after a Yes vote

Failure to sort out the current border chaos would mean the UK economy would be in free-fall and, given that Scotland exports more than twice the amount of goods per head than rUK, our economy would be hardest hit.

An independent Scotland in the EU would have the same border checks as the UK has.  With the right agreement border checks can be electronic, pretty seamless and not physical whether in or out of the EU.