Swiss police said Thursday they stumbled across a large marijuana plantation while using Google Earth, the search engine company’s satellite mapping software. Police said the find was part of a bigger investigation that led to the arrest of 16 people and seizure of 1.2 tons of marijuana as well as cash and valuables worth $780,000. Officers discovered the hemp field in the northeastern canton of Thurgau last year while investigating an alleged drug ring, said the head of Zurich police’s specialist narcotics unit Norbert Klossner.