Trespass Ab Initio Law and Legal Definition

Trespass ab initio is a trespass from the beginning. It is a trespass by retrospective operation. Trespass ab initio occurs when an entry, authority, or license is conferred by law under which conduct otherwise constituting a trespass may be justified, an abuse of such authority will destroy the privilege and render the act done in excess of authority, a trespass from the beginning, that is, from the time of the entry.