Law enforcement questions. Juvenile vs. adult incarceration -Main idea behind incarceration?

I dont know what specifically you are asking. If it has to do incarceration of kids and adults they are separated.

In California there is the California Youth Authority and there must be the equivalent in other states.

"California Youth Authority (CYA), is a division of the California Department of Corrections and Rehabilitation that provides education, training, and treatment services for California's most serious youth offenders. These youths are committed by the juvenile and criminal courts to DJJ's 11 correctional facilities, 4 conservation camps and 2 residential drug treatment programs. The DJJ provides services to juvenile offenders, ranging in age from 12 to 25, in facilities and on parole, and works closely with law enforcement, the courts, district attorneys, public defenders, probation offices and other public and private agencies involved with the problems of youth."