A study by the Center for Immigration Studies (CIS) found that non-citizens (legal and illegal immigrants) are proportionately more likely to commit federal crimes than native-born Americans. Non-citizen adults are 8.6 percent of the U.S. population, but they are 21 percent of the total of the people convicted for non-immigration crimes.
The author of the study, Steve Camarota, notes that most crimes are committed at the state and local levels, but it is hard to obtain good data at those levels on the participation on non-citizens. In any case, says Camarota, federal law enforcement is “still enormous.”
Read more at cis.org.