An employee of a private security service and his dog guard a double-fenced test area of the Swiss Agroscope Reckenholz-Taenikon (ART) research station, belonging to the Swiss Federal Office for Agriculture, in Zurich March 20, 2014. According to the University of Zurich, scientists at the university started testing genetically modified wheat lines on the field last week. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: AGRICULTURE ENVIRONMENT SCIENCE TECHNOLOGY)