It could be easily faked. But if you come down with yellow fever in a place where you claimed immunity, all they have to do is contact the doctor that stamped i

It could be easily faked. But if you come down with yellow fever in a place where you claimed immunity, all they have to do is contact the doctor that stamped it. They are regulated by the WHO and won’t lie for you. Suddenly you have a case of international fraud while bedridden in a country that takes yellow fever very seriously.