How can I find out if my Monkey Puzzle tree was poisoned by my neighbors? I found 6 holes drilled into it on their side.
Before assuming the tree has been poisoned, make sure that the holes were not actually caused by woodpeckers or flickers, since this is common behavior among such birds–and less common behavior among neighbors, one would hope!
In order to determine for sure whether your trees have been poisoned, you may wish to consider contacting a certified arborist. For a fee, an arborist will visit your property and make a diagnosis or recommend another plan of action.
For a list of arborists, contact Plant Amnesty, an organization of arborists and vetted gardeners at 206-783-9813 or visit the Pacific Northwest Chapter of the International Society of Arboriculture.
To pursue a legal solution to the problem contact the King County Law Library where County law librarians will be happy to help you with your research.
The book Neighbor Law by Emily Doskow and Lina Guillen (Nolo Press, 2014) is also a useful resource.