Patrick A. Langan, Matthew R. Durose: The Remarkable Drop in Crime in New York City. (Memento vom 16. Februar 2008 im Internet Archive) (PDF) International Conference on Crime, Dezember 2003. Zitat: „According to NYPD statistics, crime in New York City took a downturn starting around 1990 that continued for many years, shattering all the city’s old records for consecutive-year declines in crime rates.“