Only if he didn't read the label. He was employeed as the school's groundskeeper. As groundskeeper, it's his job to know what he's doing on the grounds, and that includes, unfortunately, reading labels. Otherwise, save a place for me on that great big golden gravy train.... the jury determin[ed] that Monsanto’s Roundup weedkiller caused his [plaintiff's] cancer and that the corporation failed to warn him of the health hazards from exposure. The jury further found that Monsanto “acted with malice or oppression” ... [He testified that] Monsanto should not have let him use the herbicide near schoolchildren, saying: “I never would’ve sprayed that product on school grounds or around people if I knew it would cause them harm.” https://www.theguardian.com/business...johnson-ruling
This decision will almost certainly be reversed on appeal. SanFranpsycho is once again at its most absurd.