Fruits don't uptake heavy metals

I've just returned from my second workshop in the Permaculture Design Certificate program and have learned that fruits do not generally uptake heavy metals, including lead. This means that I can leave the two trees that survived in the front yard where they spent their first year. I will need to send a sample of the fruit (when these are produced after years 2-3) to a soil lab, such as UMASS-Amherst to be tested, but this is exciting news for urban dwellers!