Yup, the feds hate it when the states go out and do something on their own and the feds know they can't do anything about it.
The only problem with the law is the same with a lot of new laws. No set definitions. Ever since the Clinton era, we're too busy arguing over what IS is in the court room. Make the growers become registered and certified with the local county. There, now all the drug warriors will know who they can and cannot touch.
Well, so much for nausea and glaucoma.