This paper provides an insight into the relationship between police and young adults, through theoretical and practical knowledge. The paper begins with a theoretical analysis of the causes of juvenile delinquency of children and minors, citing the bio-psychosocial features of young adults and their psychological characteristics. Analyzing the violations of the provisions of the Family Law and the perpetration of criminal offenses of children and minors gives an insight into the unacceptable behavior of children and minors in the Republic of Croatia. The data point to a decrease in number of children and young adults in unallowed nights out, as well as the reduction in number of children and young criminal offense perpetrators. This is due to prevention and especially preventive police activities. The paper further provides insight into police behavior towards children, young adults and minors according to the Family Law and police behavior towards the minors who are commissioning criminal offenses. The measures run by the police are aimed at reducing the unacceptable and risky behavior of children and young adults.