The problem comes in enforcing these laws. If you require foreigners to have papers on hand to prove they're allowed to be in your country, how do you determine that someone is a foreigner before demanding their papers? You have to require everyone to have their papers on hand a la USSR. Otherwise what do you do with a person who claims they are a citizen and therefore need no papers, when an officer of the law suspects they are not? Well, an alternative that seems to be favoured by certain elements in the USA is to only require brown people to have papers, while leaving the innocent white people alone.
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