Why can’t we bring in food?

I have to say, this is absolutely absurd that we aren’t allowed to bring in outside food unless it’s for a medical condition, which I have, yet security was questioning me about it which is also illegal to do so.

I go to tons of comic cons, (big ones like SDCC, NYCC, etc) ball games, theme parks, etc and I’ve never been denied entry with my own food/drinks.

I informed them I need it for my medication and they said I would bed to “prove it” with documentation. That’s actually absolutely illegal to do so. Even Disney parks allows it.

So what gives with D23 Expo?