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If the question is asking about foreign visitors (both legal and illegal) to a country of which they are not a citizen -- the answer is that the legal aliens are issued ID cards or papers of some type which identifies them as being legally admitted to the country - usually for a set predetermined length of time.

The illegal aliens have no such documentation issued to them and it should only be a matter of time before it becomes obvious who they are since it is almost impossible, in this day and age, to live and function without some type of legal government document.

If the question is actually about the extraterrestrial type of aliens - I'm sorry to say that there are no such plans in place.

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13y ago

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