What if all watchers were required to wear a video camera that would record their every interaction with citizens? In her ruling in a recent civil suit challenging the New York City police department’s notorious stop-and-frisk rousting of residents, Judge Shira A. Scheindlin of the Federal District Court in Manhattan imposed an experiment in which the police in the city’s precincts with the highest reported rates of stop-and-frisk activity would be required to wear video cameras for one year.

This is a really good idea. Earlier this year, a 12-month study by Cambridge University researchers revealed that when the city of Rialto, California, required its cops to wear cameras, the number of complaints filed against officers fell by 88 percent and the use of force by officers dropped by almost 60 percent. Watched cops are polite cops. …

Officer-worn video cameras do have the potential to violate the privacy of citizens. After all, the police frequently are dealing with people when they are having one of the worst days of their lives. For instance, police often enter people’s houses to investigate incidents. In such cases, video of someone’s literal or metaphorical dirty laundry is nobody else’s business. Consequently, Stanley argues that strong rules regarding the retention, use, and disclosure of videos from police-worn cameras must be established and enforced. For example, videos should be retained for no more than 30 to 60 days, unless flagged.