I'm quite surprised that nobody has sequenced the Cannabis plant and produced a genetically modified strain yet. They have done this with just about every major crop and with livestock. For instance, wild salmon has a gene that limits their growth to a certain season. Scientists have created a strain of salmon with this gene that grows 3 times as fast. How is it they do this with salmon but not with weed?
Really, nobody produces food using selective breeding anymore - it's all done through modification of DNA. Looks like these "breeders" are still living in the dark ages.