The police aren't the only ones in the equation, however. If law enforcement is completely powerless, then it's the criminals who will have free rein to violate people's rights and privacy. There is a balance to strike here, which requires open debate and deliberation.
South Africa, Somalia, much of Mexico, northern Myanmar, much of Syria, Sudan, the parts of Ukraine that are occupied by Russia… lots of places in the world, where the "official" government doesn't have real control.