Rootsy as this was a food crop there are other considerations as well... if there was dicamba, it is a PAN bad actor chemical for a lot of reasons...
Toxicity to humans, including carcinogenicity, reproductive and developmental toxicity, neurotoxicity, and acute toxicity.
[url]https://www.pesticideinfo.org/Detail_Chemical.jsp?Rec_Id=PC32871[/url]
[url=https://www.ilo.org/public/english/protection/safework/cis/products/icsc/dtasht/_icsc01/icsc0139.htm]ilo.org[/url]
2,4,D is also still an issue as they have only really looked at the intact chemical and there is evidence that the breakdown compounds may be really dangerous, producing dioxins ( I quote, "amine and ester products may have measurable levels of some forms of dioxin")
[url]https://pmep.cce.cornell.edu/profiles/extoxnet/24d-captan/24d-ext.html[/url]
and dioxin is nothing to mess with...
[url]https://www.ejnet.org/dioxin/[/url]
I don't want to be alarmist but we should know what we are dealing with here; it ain't eau de cologne and it may well be a noxious and nasty chemical with long term harm to both personal and environmental health (this stuff is h*ll on wheels for aquatic organisms). Brian can try to find out what they were using that day; his attourney's general office might even want to help him find out, but it is either that or shrug and hope that it was nothing bad...
That's Brian's decision...
HG