Cops will take as much freedom as you give them and often they will attempt more than they have been granted. Never give cops an inch they are not legally entitled to. In democracies, laws exist to grant people freedom from the power of the state, not to grant the state freedom from the power of the people. Any laws that grant cops protection from the people are laws of a tyranny. We get only the protections of the state that our rights make possible and no more. Trading freedom for security gets us neither.