Not really supposed to bring in, but one could. The also sell pizza, hot dogs, pretzels (warm), So Lots Of Options
It is not allowed, you might be able to sneak in a candy bar, but do you want to do that and get caught and embarrass yourself, when they have an entire snack area there, with lost of cool options.
I do not think so. In case if someone gets hungry. They offer plenty of snack variety.
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