Looking at London, here is a chart of knife attacks 2010-2019: https://www.statista.com/statistics/864736/knife-crime-in-london/ https://www.statista.com/stati

Looking at London, here is a chart of knife attacks 2010-2019: https://www.statista.com/statistics/864736/knife-crime-in-london/ https://www.statista.com/statistics/864736/knife-crime-in-lo... Other random comparisons: 2019 murders in London (population ~9 million): 149 2019 murders in Houston (population ~7 million): 140 2019 murders in Chicago (population ~2.5 million): 490 It seems difficult to assess the impact of surveillance cameras on crime. There are many factors that would impact it. It may be more instructive to look at the 'solved crime' rate. Does the % of convictions positively correlate with the number of cameras?