Even back when Snowden was current news, we'd reached the point where laser microphones could cover every window in London for a bill of materials* less than the annual budget of London's police force.
* I have no way to estimate installation costs, but smartphones show that manufacturing at this scale doesn't need to increase total cost 10x more than the B.o.M.
* I have no way to estimate installation costs, but smartphones show that manufacturing at this scale doesn't need to increase total cost 10x more than the B.o.M.