It&#x27;s already pretty common knowledge for tree care in general, there&#x27;s nothing specific about this for swings. Already ever major town or city around the country has an arborist or team of arborists to make sure trees don&#x27;t randomly fall on people and kill them, and the way they do that is by using either this test or else just manually coring the tree by cutting out a tiny section to check for rot.<p>If you as an individual want to own trees, and especially if you want to let others use your property, I don&#x27;t see any reason why you should be held to a lesser standard of care than any municipality across the country. If you can&#x27;t afford to keep your trees safe then you can&#x27;t afford the trees and&#x2F;or the property.<p>But yeah, this definitely isn&#x27;t anything beyond what you&#x27;d learn in a plant pathology 101 class in college or a basic arborist certification.