A federal judge has reaffirmed his earlier decision that the state of California cannot require a cancer warning label on glyphosate-based products such as Roundup under its Proposition 65 law.

Warning of widespread impacts throughout the food supply chain, wheat growers are spearheading a lawsuit against California for listing glyphosate as a carcinogen under the state’s Proposition 65 law, which requires labeling of ingredients “known to the state to cause cancer.”