PracticeHome and GridOne scored question.Systematic review evidence found CCTV produced a 51% crime decrease in car parks, but statistically non-significant effects in city centers, public housing and public transport. What does this justify?Only UK installations are effectiveCameras have no effect on crime in any setting at allCameras help in bounded spaces; the figure does not generalizeCameras reduce crime by about half wherever they are installedKeys 1 to 4Tested in What the Deterrence Research Actually Found