No, search Google for "Heirloom Seeds". Then call the heirloom seed company and ask them if their seeds are tested to make sure they have not cross pollinated with gmo crops. They will likely tell you that only certain varieties have been tested. That's quite alright because there are some crops that have not been genetically modified yet. For instance, there is not yet (to my knowledge) a genetically modified carrot. So, carrots do not need to be tested in a laboratory.