Multinational chemical company Bayer filed a petition with the U.S. Supreme Courtthis week, seeking a reversal of a lower court verdict that established Bayer liable for damages from the use of its weed killer Roundup, Beyond Pesticides reported Tuesday.

After purchasing Roundup-maker Monsanto in 2018, Bayer has been mired in a deluge of court battles from injured customers throughout the country who assert that their use of the glyphosate-based herbicide resulted in their cancer diagnosis. Bayer, for its part, has consistently lost these court cases. The company’s Supreme Court petition is now regarded as its best and last chance to avert responsibility for the ongoing harm to public health caused by its carcinogenic herbicide.

Bayer’s Supreme Court challenge pertains to the Hardeman v. Monsanto case. In that suit, a California court found unanimously in favor of the plaintiff, Edwin Hardeman. Mr. Hardeman told the jury he had used Roundup since the 1980s to spray poison oak and weeds around his property, resulting in his diagnosis of non-Hodgkin lymphoma in 2014. He was awarded $5.27 million, while his punitive damages were ultimately reduced from $75 to $20 million.