By some estimates, there are tens of millions of surveillance cameras in the United States. "In most of the US, CCTV cameras have proliferated over the past few decades," an expert told Insider. There are tens of millions of surveillance cameras in the United States alone, by some estimates, with some of the most populated cities in the country more heavily surveilled than others. There could be up to 100 million surveillance cameras in the USPeterson, an adjunct professor at New York's John Jay College of Criminal Justice, said that there could be up to 100 million surveillance cameras in the US, but it's impossible to say for sure because "many public and private entities own and deploy their own surveillance systems." "Between Ring cameras, security cameras, store cameras, red light cameras, cameras on the highway, you are always under surveillance," Stanton, who authored the book, "Prepared Not Scared," told Insider.

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