There is a long history to the theory of 'Broken Windows', let alone their implementation by policing, primarily in New York city by NYPD and the originator, George Keeling and NYPD's Commissioner, Bill Bratton have an article in City Journal - lots of stats are cited:http://www.city-journal.org/2015/25_...-policing.html

Taster passage:
The NYPD’s critics object, in particular, to the department’s long-standing practice of maintaining order in public spaces. This practice, widely referred to as Broken Windows or quality-of-life or order-maintenance policing, asserts that, in communities contending with high levels of disruption, maintaining order not only improves the quality of life for residents; it also reduces opportunities for more serious crime.