“A veteran lawman who oversees embattled police departments in Detroit and Oakland was appointed on Friday to monitor the operations of a controversial Arizona sheriff whose deputies had racially profiled Latino drivers”
Because Hispanics are almost never here illegally.
“As of March 2010, 11.2 million unauthorized immigrants were living in the United States”
Then see Figure 2 at
http://www.pewhispanic.org/2011/02/01/ii-current-estimates-and-trends/
Do the math, roughly 63% of illegals are Mexican.
The main article is at the first link. Be sure to check the Appendices.