"...they had used fertilizer from a waste treatment plant under the Clinton administration."

Our local waste authority has been selling the stuff for years:

http://utilities.columbus.gov/DOSD/Com-t...

They claim it's safe, but you and I both know that metallics tend to get concentrated as biomass degrades. My suspicion is that lead isn't so much an issue with this stuff as mercury, arsenic, dioxins, and so forth. Adds that down-home flavor to the tomatoes.