This chapter examines the specialised questioning skills of lawyers in first-instance criminal trials involving juvenile drug offenders in Vietnam, a particularly vulnerable group within the justice system. Against the backdrop of rising drug use and decreasing age of users, the chapter situates lawyer questioning within the broader framework of international standards, notably General Comment No. 10 of the UNCRC, and relevant Vietnamese legal provisions, including the Law on Juvenile Justice 2024. Through analysis of courtroom practices, the chapter identifies the unique psychological and procedural considerations required when working with juvenile defendants who are drug addicts, as well as with other minors participating as victims or witnesses. Detailed scenarios illustrate both ineffective and effective questioning techniques, emphasising the importance of friendly interaction, age-appropriate communication, and avoidance of stigmatising or sensitive terminology. The study further explores direct and supplementary questioning strategies, the creation of a comfortable courtroom atmosphere, and the lawyer’s role in enabling truthful and coherent testimony. Recommendations to the State include reform of legal education, incorporation of juvenile-friendly justice into professional training for lawyers, judges, and procurators, and the potential establishment of specialised juvenile drug courts. The chapter argues that enhancing lawyer skills in this area not only improves the fairness and effectiveness of trials but also reflects the humanitarian and human rights values essential to a civilised justice system, contributing to the reintegration of juvenile offenders and the prevention of recidivism.