Also helicopters are ridiculously expensive to own and operate, so they tend to be used conservatively. Departments may want to use them for many more operations, but they don't have the option. They only have one and the flight time has to be balanced by maintenance time and budget. People know this implicitly, but they keep being told how cheap UAVs are to operate, and they think they'll be in the sky constantly looking over fences and through windows and roofs monitoring people's lives.