Police in Spain have arrested members of a gang accused of defrauding victims from 35 countries of $686 million in a scam investment in cannabis plants they claimed would be used for medicinal purposes. The Spanish National Police said that the gang set up an eleaborate marketing system and attended international cannabis fairs to lure victims. Investors were told their capital would develop partnerships to finance the cultivation of medicinal cannabis plants, according to Spanish police, which led the operation with Europol and police forces from five other countries, Voice of America reporte…