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My sisters school is like this due to a boy with a life-threatening allergy. The rational is that they have to protect the childs health while he is not mature enough to protect it himself. As he gets older, he'll learn how to protect himself from such allergies (eg wearing a face mask at all time) but at the age of 4,5,6,7... he's not going to understand why he has to. In that sense I can understand the restriction as long as it is only for as long as it is deem that he is too immature to protect himself fully.
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