The world is evolving, like it always does. Our constitution and bill of rights was pretty far ahead of the curve when written but it still had and still has holes. Part of that is the imperfection of the people writing it. Part is the fact that evolution is all around us. It is in biology, it is in technology, it is in the law.
We still have the 4th amendment as our basis for personal freedom. We have tried to give it away, see act, patriot, among other methods. It's still a pretty good law but it's interpretation maybe leaves something to be desired.
I once took an oath to uphold and defend the constitution and bill of rights. I placed myself under a different set of rules, stripping me of some of those rights to defend it because I felt it was important. My little part turned out to be not so big a deal and I have frequently wondered if it was worth it, but done is done. Protecting it is done bit by bit just as losing it's power is done bit by bit.
Is civilian surveillance by police drone one of those bits we are giving up? I think it is real possible the answer is yes.