Now, trespass is an unwarranted or unjustifiable entry or intrusion by one person upon land in possession of another. It does not depend on the intention of the trespasser. Nor can he plead ignorance as to true owner or that he thought the land belonged to him. It is enough that the right of the owner or person in exclusive possession was invaded. It is a settled principle of law that where a person who initially entered upon land lawfully or pursuant to an authority given by the true owner, or person in possession subsequently abuses his position or that authority, he becomes a trespasser ab initio, his conduct relating back so as to make his initial entry trespass.
– Katsina-Alu, JSC. Dantsoho v. Mohammed (2003)