Willie’s drone was focused on Burnside and the two officers who accompanied him. All were dressed for undercover work and blended in with the street crowd. The only thing which set them apart was their apparent nervousness. After some minutes, Burnside sent his two officers away. Willie sent the drone flitting after them and discovered that they were taking up independent surveillance positions around the building the man had entered. The policemen had set up an old-fashioned stakeout. They could have used a drone similar to Willie’s, but they didn’t—a sure indication the operation was not official, since police use of remote pilot machines needed to be recorded.