If part of our calling as Christians is to bring those who have evil spirits in them to freedom, then the question as to how you know if someone does have a demonic problem becomes a pressing one. But whereas the answer to this is actually pretty straightforward, false teaching and wrong ideas once again hopelessly complicate the picture. The problem is that whereas there is a scriptural way to know when there is an obvious instance of demonisation being presented to you, erroneous notions, and some quite daft as well, as to what does constitute a definite symptom of demonic infiltration, are sadly abounding. This talk therefore examines what does, and what doesn’t, constitute a definite indication for the need for deliverance from evil spirits in someone’s life.