I would imagine it's to make sure shes's free of any communicable diseases. Although if they don't test for anything, how do they really know?
Ages ago, about 30 years, we had friends that spent a year in China. My father delighted in packing care packages for them. He'd keep an inventory of the contents and mail it off in a letter. Box would go by surface mail. It was always interesting to hear what had made it thru customs and what they'd removed from the boxes.
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