French GM Maize Ban Was Done Illegally: EU Court Official
It's not an official court ruling, just a legal opinion keep in mind, but in the opinion of the European Court of Justice's attorney general the 2008 French ban on genetically modified maize developed by Monsanto was done illegally.
Reuters reports that the ECJ attorney general said, "[France] could not suspend the planting of Monsanto's MON810 genetically modified corn...without having asked prior permission from the European Commissions." For background context, not direct connection, remember that according to documents released by Wikileaks there has been pressure from US officials on various nations of the European Union to accept the planting of GM crops from US-based companies.
The only GM crops currently approved for planting by the EU are the maize now banned in France and a potato variety developed by BASF.