TLDR: but here is a sample: "Easing alongside his farmland on the afternoon of June 7, Charles Johnson slammed his brakes and jolted his truck into park when he saw the dicamba cobra heads. Even from his cab and across the turn row, he could see the telltale hooded cupping of stretched soybean leaves indicative of dicamba presence. ... "

The root cause of the problem is dicamba-ready seed modifications.

See:

http://forums.gardenweb.com/discussions/4720845/herbicide-drift-problems?n=2