They have to be off. But Controllers still Snapchat at times. https://thehill.com/blogs/blog-briefing-room/news/268495-report-air-traffic-controllers-discipli

They have to be off. But Controllers still Snapchat at times. https://thehill.com/blogs/blog-briefing-room/news/268495-report-air-traffic-controllers-disciplined-for-snapchatting-on-duty https://thehill.com/blogs/blog-briefing-room/news/268495-rep... But more to the point, the poster I was replying to did not claim that the witness was working in the control tower. Merely that they observed a drone hovering near the control tower. Of course, they might have been far enough away that they couldn't capture a photo. That would indicate that they likely were far enough away that they couldn't definitively ID a drone, too.