Text: “Riots erupt in Vancouver after Canucks loss”

Extract: “Riot police fired tear gas, pepper spray and flash bombs in downtown Vancouver Wednesday night to try to disperse angry rioters who set cars on fire, looted stores and taunted police officers after the Canucks’ 4-0 Stanley Cup final loss to the Boston Bruins.” https://www.cbc.ca/news/canada/british-columbia/riots-erupt-in-vancouver-after-canucks-loss-1.993707

In the police investigation after the riots city-owned and operated surveillance cameras were used to try and identify suspects in the riot. There was some concern though about the potential for abuse and the growing amount of surveillance in the Vancouver area. What guidelines should there be for the use of surveillance cameras? How long should be recordings be kept? How much surveillance is acceptable? How are these boundaries determined?