Recently came across a informative article describing the findings of the Kansas State University Agricultural Experiment Station and Cooperative Extension Service that seems to put to bed some serious concerns over urban gardening produce. The basic gist of the matter is that in many cases when gardening in challenged areas the use of compost and other soil additions and an adjustment of the soil pH can alter the soil to the point that it can be safely used to grow food. The researchers also endorse using raised plant beds, making sure to wash your hands after gardening and to wash all produce. Read the full article here : Researchers Work to Ensure Safety of Urban Gardens