The free movement of citizens of member-nations across the subregion, designed to boost economic profile, promotes borderlessness in West Africa. The ECOWAS Protocol on Free Movement of Persons, Goods and Services is without doubt a potent tool for closing the economic gap between the core-member-nations and peripheral-member-nations. However, the architect of this Protocol did not envisage the security implications inherent in borderlessness and its consequence on policing the subregion effectively. This paper examines the spate of insecurity in some member-nations vis-à-vis the nature and geography of the emerging terrorism. The paper relies on both primary (a case study of a convict in Nigerian Correctional Service, Oko, Benin City) and secondary data and draws strength from Cloward and Ohlin’s Crime Opportunity theory in explaining the festering transnational organised crime (TOC) in the subregion. It concludes that the free movement of ECOWAS citizens as well as member-nations’ complacency have created opportunity for criminal networking and compounded policing in the subregion. It suggests that the ECOWAS free movement protocol should be reviewed to enhance effective policing in the subregion.