Not to be pickier, but the statistic that the Newsmax article uses is from an Investors Business Daily article written in March of 2005. Would you impeach their reporting as well? But, since you wanted the statistics from a government site, I will endeavor to find the statistic elsewhere. 40% or more seems perfectly plausible in California. Come and visit our state some time and see for yourself. :)
Is the web site for the Cal Dept of Corrections. It shows 37% of prisoners Hispanic, v. 32% of population. So pop of california is over 11 million Hispanics, and 4 million is the highest estimate (way above the Census estimate) of illegals, so maybe 20% of all prisoners being illegal aliens would be about right. Also note that hispanics are more concentrated in the more crime-prone younger ages [not many criminals among the Leisure World crowd, of whatever race], so the age comparable comparison is even closer to parity.
All crime is still a huge problem -- is I said earlier, the trick is to get a policy to keep the productive and keep out the criminals and moochers.