been determined to pose an unacceptable risk. A hazard is the tree part(s) identified as a likely source of harm. Arborists should take care in their choice of words to avoid unintended meanings, which could, in some cases, have serious implications if a case ends up in court. Arborists are cautioned against declaring a tree to be " safe " or suggesting that trees can be made " safe. " Trees are living organisms that sometimes fail unexpectedly despite reasonable efforts to responsibly maintain them. Tree risk assessors can only recommend measures to reduce, not eliminate, the risk of unanticipated structural failure. 44