Indeed, the US incarceration rate has become the highest of any country in the world. In California alone, there are more people imprisoned than in any other country in the world except China.
The number of adults incarcerated in federal or state prisons or local jails in the United States skyrocketed during this period, quadrupling from just over 500,000 in 1980 to 2.2 million in 2005, according to the Department of Justice. Two-thirds of those are in federal or state prisons and one-third in local jails; the vast majority are young men between 18 and 39. An estimated 80 percent of them either violated drug or alcohol laws, were high at the time they committed their crimes, stole property to buy drugs, or had a history of drug and alcohol abuse and addiction — or some combination of those characteristics. Adding those on parole or probation to the incarcerated population, nearly 7 million adults are currently under correctional supervision, 3.2 percent of all US adults 18 or older.

In addressing the common idea that immigration brings crime:

The total incarceration rate for the native born is more than one percentage point higher in California than in the rest of the country (4.5 percent to 3.4 percent). In contrast, the incarceration rate for the foreign born in California was less than half the foreign-born rate in the rest of the country (0.4 percent to 1.0 percent).

So really, its the disenchanted second generation that you have to look out for....

http://www.migrationinformation.org/USFocus/display.cfm?ID=403