Supreme Court Roundup case divide

Justices questioned whether the EPA's approval of the product's label should preempt local health warnings required by state laws.

Bayer argues that a patchwork of state regulations would create an impossible burden for manufacturers of federally approved pesticides.

Lawyers for the plaintiffs contend that state laws provide a necessary layer of consumer protection against undisclosed risks.

The case is being closely watched by the agricultural industry and environmental health advocates.