What is very serious is using someone's passport without his knowledge. On exiting Israel on one occasion, and presenting my Israeli passport at border controls, as is legal and compulsory, I was told 'you have another passport,haven't you?' I agreed I had, and was asked to show it. The woman controller then examined the passport, picked up the phone and had a short conversation with someone-all the time with my second passport out of sight, possibly being photographed. It was then handed back to me without comment. Some months later the scandal broke over the failed Mossad coup using second passports of Israeli citizens - a crime of which the owners of the passports were unaware. If I am ever asked again, I shall inform the controller that I am not bound by law to show any document but my Israeli passport or other Israeli documents, and refuse to hand my other passport over for inspection.
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from the article: Torn between two passports: Prisoner X and dual citizenship