It is a bit of a problem that they put young people in prisons since they gat more bad influence there than anywhere else and come out worse for it.
But what should we do about it, society needs a system that makes people feel that the world is fair even though it isnt.
Besides, people who do commit crimes usually need help to get back to the right track again.
There is actually a high chance that he is very helpable, but only if he understands the terrible effects the drugs have on his life and those around him.
this is gonna sound harsh, I know because I have an adicted father and my grandfather is a sober alcoholic, but the best (and accoarding to most the only) way for him to understand is if you make him understand. As long as he has family who accepts his adiction he can't truly understand the magnitude of his problem.
Every time he choses drugs he choses them over you and you should make that crystal clear, so Every time he does that choice it gets harder when you distance your selves from him.
But every time he attempts to be better you should fully support him, help him if he is about to stumble. But every time he falls back into his bad habits you can't stay for him, he will have to take that journey all over again.
And now that he is in jail he is taking a turn for the better, since he is more likely to be off the drugs while in there (if he doesn't manage to get a hold on some drugs in jail, but that is much harder than on the streets) so now is the time for you and your family to support him.
love him and trust him, and make him understand that you are more important to him than any high in the world ever could be.
There usually are some good psychiatrists available in these facilities and you should really encourage him to talk to one, and by that I mean REALLY talk, not go on about the weather until the session is over, that wont do anyone any good. there is probably nothing wrong with him per se, he is just a kid in some deep sh*t he needs help sorting out.
help him understand what he has done is wrong and why he is in jail, and help him understand why such knowledge and understanding is important for him to make his life better.
If you think about your little brother, the memories from your childhood, I think you will realize he is not a bad person, not to the core anyway, he is just a confused kid and in trouble.
He, like most humans, love and is loved by other as well, he is human and humans are faulty, humans are irresponsible, but in essence humans aren't evil, so neither is your brother.
We all have our lesser moments, and this is vital to understand to be able to help him.
Instead of think of how terrible it is that he is in jail, see this as an opportunity to truly help him to get back to the right track. he probably can't do this entierly on his own that's why he needs you help, and this will probably not just help him but you and your entire family will be stronger for it in the end.
It is a quite the project, I know, and it is gonna be really hard, but I sincerely wish you, your family and your brother the best of luck.