The study examined the mediating role of drug use history in the relationship between clinical personality patterns and Criminal Behaviour (CB) among convicted inmates of Nigeria correctional institution (Oke-Kura) Ilorin, Kwara. A total of 450 convicted inmates participated in the study. Their age range is 18-25 years. The study employed ex post facto research design and purposive sampling techniques. The result revealed that drug use history significantly predicts criminal behaviour f(2;375) = 11.438, p < .01, while the post-hoc result presented shows that respondents with a drug use history had the highest level of criminal behaviour (M = 24.39; SD = 8.512). The clinical personality patterns significantly predict criminal behaviour (R = .354; R² = .126; F (11) = 3.879; P < .001). The drug use history as a mediating factor significantly predicts the relationship between clinical personality patterns and criminal behaviour (b = .06, t = 3.682, p <. 01). This study also revealed that clinical personality patterns predict criminal behaviour (b = .008, t = -5.12; p < .001). It was concluded that drug use history mediates between clinical personality patterns and criminal behaviour
Omojola et al. (Tue,) studied this question.