Monsanto has provided a list of factual statements. If you don't trust them, you can fact-check them. You either are going to have proof that they are lying, or proof that they are telling the truth.
Refusing to accept what Monsanto says by virtue of them being Monsanto is, again, just another part of the anti-GMO hysteria...
"To conclude this series, I have found no evidence that farmers are sued by Monsanto for inadvertent contamination. The lawsuits that I examined were for cases where farmers knowingly and admittedly used Monsanto seeds without licensing contracts."
If it’s happened, then there should be some credible source detailing the case in which it happened. No such source exists.
Of course, nobody has ever debunked this page, because there's nothing to debunk.
Myth: Monsanto sues farmers when GM seed is accidentally in their fields.
Fact: Monsanto has never sued a farmer when trace amounts of our patented seeds or traits were present in the farmer’s field as an accident or as a result of inadvertent means.