Joe Arpaio's Maricopa County Sheriff's Office has become imfamous for its stance on illegal immigration. Some call it racial profiling; some think it's just simple law enforcement. Whatever it is, it's controversial. From the state border north to Maricopa County, police officers and border patrol agents are hunting for illegal immigrants.The Yuma Sector of the U.S. Border Patrol supervises 126 miles of borderland in Arizona and California. Using the highest-profile form of technology to date, the fence (or as agents call it, "the line") acts as the biggest physical barrier illegal aliens strive to overcome in the attempt to cross to the United States. Should they successfully cross, agents rely on other forms of technology to secure the safety of not only themselves, but also those attempting to make it to America. See a slideshow here.