 scrutinizing how a gunman was allowed to scale it, you don't say. The building, owned by a glass and research company, is adjacent to the Butler Farm Show, an outdoor venue in Butler, Pennsylvania. The Secret Service was aware of the risks associated with it, the sources said. Someone should have been on the roof or securing the building so no one could get on the roof, said one of the sources, a former senior Secret Service agent who was familiar with the planning.