It can't hurt, but it won't make the charge to away. How much it helps depends on many factors. A good lawyer will help even more.
Will make the person more presentable in court as it shows an effort to try to "clean up." However, the charge will remain the same. This might help the prosecutor in offering a better plea and can help at the sentencing phase of the case. Have him/her seek out a criminal defense attorney.
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Will make the person more likable in court as it would show effort in trying to clean up their lives, but the charge will remain the same. In that case, you could get a better plea offer and a lesser sentencing if the Judge has discretion. Hire a good criminal defense attorney.
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