Except for health-related cannabis, cannabis is prohibited in Germany. Irrespective of this, the law is fairly lenient within the leisure use of cannabis. When the police find you carrying 15g or significantly less of weed, they will choose you all the way down to the station for mugshots and questioning. https://thesocialcircles.com/story4410045/weed-in-dortmund-can-be-fun-for-anyone