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[citation needed] There is causative evidence to suggest the rise and fall of crime in the 20th century is directly linked to lead in consumer products, especially gasoline. Everything else is correlative and speculative, including the hypotheses that more police or more incarceration decrease crime.The drop in crime was not a result of smaller government; it was a result of better and smarter government, including more incarceration, elevated security, better intervention and prevention programs, an increase in police officers per capita, enforcing quality-of-life offenses, more effective identification of criminal patterns and more advanced use of data.