Change sentencing provisions for crimes committed by a person younger than eighteen years of age

Nebraska's LB 584 changes sentencing for juveniles (under 18) convicted of felonies. It establishes new minimum and maximum prison terms for Class IA through IIA felonies, such as 20-50 years for Class IA offenses. The bill requires courts to consider specific mitigating factors like the defendant's age, family environment, mental health evaluations, and developmental history before sentencing. This replaces previous sentencing rules and harmonizes juvenile sentencing with Nebraska's Juvenile Code, allowing courts to use juvenile disposition options instead of standard penalties.