Yang Zhaoyuan, a staff officer with the NPA's Public Order Division, says that the crime rate is indeed going down (from 1,756 cases per 100,000 in 2004 to 1,192 in 2008, a drop of 32 %), but there's no proof it's due to the cameras.
警政署保安組警務正楊肇元指出，犯罪率確實在下降中從 2004 年每 10 萬人口 1,756 件下降至 2008 年的 1,192 件，降幅達 32％），但沒有實證證明是監視器的功勞。