Several legal experts believe that criminal prosecution of cannabis users doesn't serve the desired purpose. Lorenz Böllinger, emeritus professor of criminal law at Bremen University, founded the ‘Schildow Circle' two years ago. It now consists of 122 criminal law professors who are campaigning to legalize the sale and ownership of marijuana.

http://www.dw.de/law-professors-demand-cannabis-legalization/a-17559144