The widely cited figure of 1/3 foreigners in our jails is for FEDERAL prisons, which hold only about 10% of all prisoners (and, of course, concentrate on smuggling, immigration and other offenses whre foreigners would be overrepresented). A DOJ reports says only about 10% of the total number of prisoners in the US are foreigners. Check the site for “Bureau of Justice Statistics.”
It surprises me that there are no illegal aliens in state prisons. There’s no illegal in San Quentin?