known as E-Verify), and in some cases an open acceptance and willingness to pay the fines imposed. While immigration policy design in the U.S. can and does have an effect on apprehensions and migratory patterns, external factors and determinants that exist outside of U.S. immigration policy also influence migratory flows and subsequent legal or illegal immigration. A study by Joshua Linder titled, The Amnesty Effect: Evidence from the 1986 Immigration Reform and Control Act, found that the “economic conditions in Mexico have the greatest impact on the flow of undocumented immigrants”. Others attribute IRCA's failure to stem illegal immigration to its focus on tougher border enforcement. Border Patrol focused its efforts on common entry areas along the U.S.-Mexico border; however, this pushed migrants to more rural, less-policed areas along the border and encouraged new tactics such as the use of "coyotes" and underground tunnels. On crime A 2015 study found that the legalization of three million immigrants reduced crime by 3 to 5%, primarily property crime. Its author asserts that to be caused by greater job market opportunities for the immigrants. Contrastingly, a 2014 study in the American Economic Journal: Economic Policy found that IRCA likely caused an increase in crime, especially felony drug charges, by restricting the employment opportunities for unauthorized migrants. Its authors, in a 2015 journal article, further argue that the changes in felony charges could be motivated by the police’s shift in treatment and persecution of immigrants after IRCA was enacted. This is particularly accurate for Hispanic individuals, who accounted for approximately three-fourths of the 2.7 million immigrants that received a legal status through the LAW and SAW programs included in IRCA. Others have found a direct relation between the passing of IRCA in 1986 with the decline in arrests along the U.S-Mexico border, explained by the amnesty provided to those non-citizens eligible that would have otherwise been part of the seasonal immigration flow. Structure of the Act and relationship to United States Code Following the Short title, the IRCA is divided into seven Titles (I through VII). Title I is divided into parts A, B, and C, and Title III is divided into parts A and B. The IRCA affects 8 USC 1101. Additional portions of the U.S. Code created or amended by the IRCA include, but are not necessarily limited to: Parts A and B of Title I: 8 USC 1324, 8 USC 1324a,