• Bowman v. Monsanto Co. (2013): The U.S. Supreme Court ruled unanimously against Indiana farmer Vernon Hugh Bowman. Bowman bought commodity soybeans from a local grain elevator—knowing they contained Monsanto's patented technology—and replanted them across multiple seasons to bypass technology fees. The court found that patent exhaustion does not permit unauthorized reproduction of patented seeds. Details are available via the Center for Agricultural Law and Taxation.
• Percy Schmeiser (199

: Canadian canola farmer Percy Schmeiser was sued by Monsanto after genetically modified canola plants appeared on his land. The Canadian Supreme Court ultimately ruled against him, establishing that growing plants with patented genes without a license constituted infringement regardless of how they arrived.
• Systemic Enforcement: Studies by groups like the Center for Food Safety note that agrochemical companies have filed hundreds of patent-infringement lawsuits against small farmers and seed cleaners.
Been a problem for years
Oh and yea, farmers get sued and such for saving rain water to.