of course you are right, it takes a special permission.
I did a google research about "Tourette syndrome and Cannabis" which brought several links in German, one of them by the University of Hannover, and also the TV docu I mentioned.http://www.google.de/url?sa=t&source=we ... eA&cad=rja
Perhaps you can understand it, if not, let me know, I will give it a try. In any case a court of law decided he is entiteld to getting "medical Cannabis" via prescription in a pharmacy, I also found an English link. Hold on.