Atrazine became common in the early 1960s on farms. My Dad says the local elevator hosted a meeting for farmers with a representative of CIBA-Geigy explaining atrazine. He also explained how safe it was all the while he was mixing some up. At the end of the meeting he DRANK it. If he was using the real thing his grave is probably still glowing.
“Atrazine has recently been associated with causing imbalances in hormone levels in laboratory animals, possibly disrupting reproductive and developmental processes on a short-term basis. Following a 2002 risk assessment, the U.S. Environmental Protection Agency reported that atrazine is not likely to be carcinogenic to humans.”
https://drinktap.org/Water-Info/Whats-in-My-Water/Atrazine