A Nihon University student died after falling from the rooftop of a building in Tokyo, with an autopsy finding traces of cannabis in his urine, investigative sources said Monday.The 20-year-old, a member of the school's dance club, was found after a passerby notified police of a person lying on the ground near the building on Saturday morning, according to the sources.He had been attending a drinking party put on by the club at a rental space in the building in the capital's Ueno district on Friday.The Metropolitan Police Department questioned several dozen students who were at the party an…READ FULL ARTICLE