Kate being a naughty girl

So as we all know, when Kate was arrested when she was rescued from The Island, she was then let on bail, and then she later on went on to go on Ajira 316 and fly out of the country...

So I'm confused by this, because I am studying Law at my school now, and I now know that when you are granted bail, you have to give in things like your passport so you cannot skip the country... And Kate clearly got on a plane with her passport (and no she wouldn't have had another, she got on the plane pretty quick after she decided to, and it takes ages for passports to be made) So my question is this, should we count this as a blooper/error, or not?

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