A California state court has dismissed a legal challenge by multinational agribusiness firm Monsanto that seeks to bar the state from adding glyphosate, the lead ingredient in the company’s Roundup herbicide, to a list of cancer-causing chemicals.
On March 10, Fresno County Superior Court Judge Kristi Culver Kapetan ruled against Monsanto’s challenge to a provision of Proposition 65, a California voter initiative passed in 1986 that requires the state’s governor to publicize a list of chemicals known to cause cancer.
The California Office of Environmental Health Health Hazard Assessment proposed to add glyphosate to the Proposition 65 list after the World Health Organization’s International Agency for Research on Cancer (IARC) classified the chemical as a probable human carcinogen in 2015.
“The law requires that certain substances identified by the International Agency for Research on Cancer (IARC) be listed as known to cause cancer under Proposition 65,” the state agency said in September 2015.
Glyphosate is a key ingredient of Monsanto’s flagship weedkiller well-known under the trade name ‘Roundup.’ It is one of the most heavily used herbicides in the world and is designed to go along with genetically-modified “Roundup Ready” crops, also produced by Monsanto.