The Public Policy Institute of California, in a June 2008 “Just the Facts” publication, “Immigrants and Crime,” available at, stated:

“The incarceration rate for foreign?born adults [legal and undocumented] is 297 per 100,000 in the population, compared to 813 per 100,000 for U.S.?born adults. The foreign?born, who make up roughly 35% of California’s adult population, constitute 17% of the state prison population, a proportion that has remained fairly constant since 1990…

Among men ages 18?40, the foreign?born have an institutionalization rate of 420 per 100,000 in the population, compared to 4,200 per 100,000 for the native?born. The wider institutionalized population includes those in jails, halfway houses, and similar institutions where youths and others convicted of less serious crimes are housed.”

June 2008