I disagree with Sheng Jie that the recordings of CCTVs can be used to find out who the thieves are. Nowadays, theives will disguise themselves before they want to steal some stuff. Even if the CCTV take down their actions, they will not be able to identify the theif and thus letting him escape without punishment.
I agree with ShengJie that the CCTV would not be able to capture everything thats in a shop or house or other places. So, more CCTVs would be installed and the expenses of CCTVs is not low. You would need money to maintain it and as CCTVs are most probably on 24/7, a lot of electricity would be used up thus increasing your electicity bills and will also increase the speed of global warming.
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