Personal identity (17)

If the psychological continuity criterion is right, what sense does it have then to have passport control at national borders? What sense does it have then to take an identity card with you? For such a document identifies the body but not the person. What is then the sense of taking finger prints? Maybe they can prove that the body did the murder but not that the person in the body did. If a person wants to enter a country illegally, rather than passing the border with a false passport it is safer for him or her to pass the border in another body with the passport belonging to this body.