Aside from medical marijuana, cannabis is illegal in Germany. In-spite of this, the regulation is fairly lenient over the recreational usage of cannabis. Once the law enforcement find you carrying 15g or fewer of weed, they are going to acquire you down to the station for mugshots and questioning. https://zanderhbpdr.wikicarrier.com/180716/how_where_to_get_weed_in_frankfurt_can_save_you_time_stress_and_money