Standing by the side of Highway 63 with the Missouri state Capitol on the horizon, there’s a billboard that says, "Stand Up for Glyphosate."

Glyphosate is the key ingredient of Roundup, the flagship herbicide of Monsanto. Monsanto was based in St. Louis until it was purchased by German company Bayer in 2016. Monsanto and Bayer have been subject to tens of thousands of lawsuits alleging they didn’t warn customers that exposure to Roundup could cause cancer.

There’s no scientific consensus that Roundup is a carcinogen, but judgments and settlements have cost Bayer billions. Most recently, a Missouri appeals court upheld a $611 million judgment against the company.

A bill introduced by Rep. Dane Diehl, R-Butler, this year and supported by Bayer would have insulated Bayer and other ch

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