Reply to Marvi Ng Yi Song's Post

That being said, most CCTV cameras have very low resolution. This can hamper spotting criminals. Also, there are bound to be some blind spots which CCTV's cannot see. With so many CCTV's, there are many screen which have to be monitored. Many guards have to be employed to keep track of what is happening in each screen at any given time. Also, humans can make errors, and see wrongly.