It's a new invention. On it's various pages are stamps and dates that show when you entered and left a foreign nation. The idea behind this relatively new invention is that it shows what nation you are from, and where you have been. It is used as identification in both foreign nations, and domestically. I understand that the next generation is going to have computer chips built in to make it even easier for people to be identified when they enter a nation.
Now, if we only had a group of people who met travelers who are either returning or entering the nation to see if they have contraband or perhaps some sort of authorization, we could call it a travel visa. Then this group, we could call them Customs Agents, could be told to look for people who have been in the nations of Guinea, Sierra Leone, or Liberia and then we could shunt them to a holding facility for some sort of extensive screening more advanced than a thermal scanner. We could even provide these people with pictures of the stamps to look for.
Oh, I guess it will never happen. With the Republicans in charge of the House we'll never get a bunch of people out to the airports and docks to screen people arriving in the nation.
Do I really need to add the 
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