Possession cannot be adverse if it is by the express or implied permission of the true owner. However, note that if the owner has merely stood by and refrained from requiring possession, there is no implied permission. And any permission may expire or be revoked, in which case possession will be adverse after that time. See Practice Note: Establishing adverse possession of land. In any case, the true owner may have practical difficulty producing evidence of the facts in the absence of clear documentation. Note, however, that if the land is registered and 12 years’