Snapshot Adolescent Brain Development and Youth Justice

Brain Development: Over the past several years, research has shown that the brain continues to mature even after an individual reaches the legal age of majority. In fact, studies suggest that brain development continues into one’s mid-to-late 20s.

Self-Control: Since their prefrontal cortex is still developing, young people experiment, take risks, and focus more on their relationships with peers. This has been found to be especially true for young males.

Decision Making: Adolescents and young adults need guidance and support to consider the long-term consequences of their actions or make future-oriented decisions.

Response to Incentives: Young people are particularly receptive to reward-based responses. While positive incentives can contribute to adverse decisions, they can also be used to encourage positive and prosocial behavior.

Transitory Behavior: Justice-involved youth often outgrow delinquent behavior with only a small percent continuing to commit offenses as adults.  

Age Boundaries for Juvenile Court Jurisdiction: Maryland recently passed legislation narrowing the circumstances under which a person younger than 13 can enter the juvenile justice system. In 23 states, there is no specified lower threshold age for juvenile court jurisdiction. In most states, once an individual reaches 18, that person falls under the purview of adult criminal court. However, Vermont allows 18-year-olds to remain in the juvenile justice system.

Diversion: The Idaho Legislature enacted a new law that allows prosecuting attorneys to refer a young person’s case directly to probation or a community-based diversion program for informal supervision and counseling. At least 34 states have codified laws that provide for at least one form of diversion or alternative to formal court processing.

Age-Appropriate Responses: Some jurisdictions have been turning to psychologists to assist with revising juvenile probation policies. In Pennsylvania and Ohio for example, probation policies are centered around incentivizing progress toward the goals of a supervision program rather than punishing non-compliance with the conditions of supervision.

Due Process: A number of states are taking steps to safeguard a young person’s due process rights during custodial interrogations. In 2022, five states—Arizona, California, Delaware, Maryland and Utah—codified requirements for law enforcement who take youth into custody for questioning. Many of these laws prohibit the use of deception or psychologically manipulative interrogation tactics when questioning a minor. 

Reducing Collateral Consequences: While all states allow juvenile records to be sealed or expunged, the process and criteria for expungement varies between jurisdictions. At least 22 states have codified laws that automatically seal or expunge juvenile records in certain circumstances. Indiana provides a procedure for automatic expungement of most misdemeanor records within 60 days of a young person reaching age 19. Judges are allowed discretion to not expunge a record if it “would not serve the interests of justice.” Sealing or expunging a young person’s record can help reduce barriers to employment, education and housing.