This study examined the influence of substance abuse on moral development among secondary
school students in the Federal Capital Territory (FCT), Abuja, Nigeria, with particular
reference to the moderating role of intervention programmes of the National Drug Law
Enforcement Agency. Substance abuse among adolescents has become a growing concern due
to its negative implications on behavioral adjustment, academic performance, and moral
development. The study was guided by Problem Behaviour Theory and Kohlberg’s Theory of
Moral Development, which explain substance abuse as part of a broader pattern of
maladaptive behaviours and highlight the stages of moral reasoning among adolescents. The
study adopted a descriptive survey research design. The population comprised secondary
school students in FCT, Abuja, while a sample was selected using an appropriate sampling
technique. Data were collected using a structured questionnaire and analyzed using descriptive
and inferential statistics. The findings revealed that substance abuse has a significant negative
influence on moral development among secondary school students. It was also found that
students exposed to NDLEA intervention programmes demonstrated better awareness of the
dangers of drug abuse and exhibited relatively improved moral behaviour compared to those
not exposed. The study further established that NDLEA intervention programmes play a
moderating role by reducing the strength of the relationship between substance abuse and poor
moral development through drug education, school outreach, counselling services, and
community sensitization. However, the persistence of substance abuse among students suggests
that these interventions require strengthening in terms of coverage, consistency, and
engagement strategies. The study concluded that substance abuse significantly undermines
moral development among secondary school students in FCT, Abuja, while NDLEA
intervention programmes have the potential to mitigate its effects when effectively
implemented. It was recommended that NDLEA should intensify school-based drug education
programmes, strengthen collaboration with schools and parents, and expand counselling and
preventive interventions to enhance students’ moral and behavioral outcomes.