Definition
Zero tolerance is a policing strategy in which low-level offences and signs of disorder — fare evasion, public drinking, graffiti, panhandling, minor drug possession — are enforced strictly and without discretion, on the theory that visible order prevents more serious crime. It is the operational shorthand for "broken windows" policing.
The theoretical pedigree runs from James Q. Wilson and George Kelling's 1982 Atlantic essay Broken Windows, which argued that uncorrected minor disorder signals that no one is in charge and invites escalation. The strategy was implemented most famously by William Bratton as New York Transit Police chief and then NYPD commissioner in the early 1990s, and was widely copied by police forces and city governments seeking dramatic results.
Why it matters
How it works
In operational terms, zero tolerance reorganises patrol around proactive enforcement of minor offences, supported by data systems such as CompStat that track local conditions and pressure precinct commanders to drive numbers down. It pairs with aggressive stop-and-search, public-order summonses, and quality-of-life policing aimed at homeless people, street vendors, and young men loitering in groups.
Evaluations are mixed. New York's crime fell sharply in the 1990s, but similar declines happened in cities that adopted nothing resembling zero tolerance, and rigorous studies struggle to isolate its independent effect. Critics — among them Bernard Harcourt and the U.S. courts that ruled NYPD stop-and-frisk unconstitutional in 2013 — point to the racial concentration of enforcement, the long-term costs of criminalising poverty, and the corrosion of police legitimacy. Many cities have since pivoted to "focused deterrence" or problem-oriented approaches that retain the data discipline without the indiscriminate harvest of low-level arrests.