More than 70% of cannabis in circulation in Europe transits through Andalusia, in southern Spain. The drug is transported from Morocco on speedboats across the Strait of Gibraltar. Located just 30 kilometres from the north African coast, the Spanish town of La Linea de la Concepcion has become infamous for its almost industrial trade in drug trafficking - sometimes in broad daylight. Our correspondents in Spain report. A programme prepared by Patrick Lovett, Rebecca Martin and James Vasina.