In Freedom of Religion and Its Regulation in Nigeria: Analysis of Preaching Board Laws in Some States of Northern Nigeria, Ahmed Salisu Garba provides an account of how states in Northern Nigeria have enacted laws to regulate religious preaching in the spheres of influence. The work examines the debates surrounding the laws and how the state in collaboration with dominant religious groups persecuted members of minority religious in the states. The author applied an argumentative approach to raise and analyse issues relating to the reasonability of the laws in Nigeria, reasons for their enactment, judicial review mechanisms employed in the determination of the reasonability of the laws in democracies, and how they accord with the freedom of religion clause in the Nigerian Constitution.