To me, the best thing about this, other than the safe outcome, is that the drone was being operated by an “official” person and not some thrill seeking amateur. That’s because it points out that EVERYONE, civilian or government operator, needs to follow proper procedure. Even if the police had justification for operating where they were, they still need to advise ATC officials so they can warn inbound aircraft of the situation. If the police were unaware of the need to do so, or just thought their needs overruled the proper procedures, then maybe their drone “pilot” needs some better training. They can block off the streets to keep a crime scene isolated, but they need to look up and see what is overhead.