Who analyzed the samples?
Morse Laboratories of Sacramento, CA did the 2,4-D and chlorpyrifos analyses, and Monsantos Environmental Sciences Research Laboratory did the glyphosate analyses. The investigators arranged for the Environmental Protection Agency to re-analyze a number of the 2,4-D and chlorpyrifos samples as a quality control check. They also arranged for the Centers for Disease Control to perform confirmatory analyses on the glyphosate samples.