Page "Broken windows theory" Paragraph 14

The book's author, George L. Kelling, was hired as a consultant to the New York City Transit Authority in 1985, and measures to test the broken windows theory were implemented by David Gunn.

The presence of graffiti was intensively targeted, and the subway system was cleaned from 1984 until 1990.

Kelling has also been hired as a consultant to Boston's and Los Angeles's Police Departments.