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[It's a number of different things to respond to all at once.]
Let me see where to begin. I'll go with the easiest thing first. Rehabilitation points can allow you to have special privileges within the dome. You can request items from home, special favors, or anything you can really think of if you have the right amount of rehabilitation points. It's kind of like an invisible currency, if you want to look at it like that. One that only works with the wardens.
[Lifting a hand up she taps her lips, contemplating things quietly..]
How to get them though. Just having good behavior long term. You could get some by picking up after an event, attending school or participating in clubs. Doing things that will help yourself become a better person or help others. Even adopting a pet and caring for it properly can earn you more. Meanwhile you'll lose points if you litter, destroy property or get into fights. [Basically anything that would exhibit bad behavior. She frowns after a moment, and her attention upon Yona in the video becomes more focused. This is where things become... not nearly as pleasant]
Your other question is a difficult one to answer. It's not all good news, either. I think it's important to know, though.