Pesticide products expert witnesses may write reports and testify on pesticide contamination, insecticides, and pesticide products. In The Globally Harmonized System of Classification and Labeling of Chemicals the EPA Office of Pesticide Programs describes GHS:
The GHS establishes classification criteria for physical, health and environmental hazards, along with associated hazard communication elements, notably pictograms, signal words, and hazard statements for use on labels. It is based on harmonizing major existing systems for classifying and labeling of chemicals in transport and in the workplace, in pesticides, and in consumer products. A key guiding principle of the GHS harmonization effort was that harmonization should be accomplished without lowering the level of protection afforded by existing systems. It was also acknowledged that changes in all systems would be required to achieve a single, globally harmonized system.