In order for a tree to be considered hazardous it must meet two criteria. The tree, or a tree part, must be at an increased likelihood of failure, usually due to the presence of some structural defect. i.e the presence of a significant amount of decay in a portion of the tree, and there must be one or more dangers present. These dangers may be any person or property that could potentially be damaged or injured if a failure occurs. If there are no real dangers present and there are no risks the tree will not be considered a hazard, even if it is structurally unsound and likely to fail at any time.