Final answer:
The Supreme Court case that established the rights for youths to have counsel, to review evidence, and to have a hearing before being waived to adult court is Kent v. U.S.
Step-by-step explanation:
The case that ruled that youths have the right to review evidence, have counsel, and have a hearing before being waived to adult court is Kent v. U.S.
In 1966, Morris Kent, a 16-year-old, was taken into police custody and, without counsel or a proper hearing, was waived to adult court. This case raised significant questions about the procedural protections due to juveniles during waiver proceedings. The Supreme Court decided that juveniles should be afforded a hearing, access to counsel, and the opportunity to review the evidence against them before being transferred to adult court. This decision safeguarded the rights of young defendants to have a fair hearing and the benefit of legal counsel during the process.
This ruling, alongside other landmark decisions like Gideon v. Wainwright, which requires the state to provide legal representation to defendants who cannot afford an attorney, and In re Gault, which extended protections under the Due Process Clause to juveniles, form a key part of the juvenile justice system in the United States.