A 2018 study found that undocumented immigration to the United States did not increase violent crime. Research finds that Secure Communities, an immigration enforcement program which led to a quarter of a million of detentions (when the study was published; November 2014), had no observable impact on the crime rate. A 2015 study found that the 1986 Immigration Reform and Control Act, which legalized almost 3 million immigrants, led to "decreases in crime of 3–5 percent, primarily due to decline in property crimes, equivalent to 120,000-180,000 fewer violent and property crimes committed each year due to legalization".