The Cato Institute, a very conservative think tank, has this information:

Andrew Forrester, Michelangelo Landgrave, and I published a new working paper on illegal immigration and crime in Texas. Our paper is slated to appear as a chapter in a volume published by Oxford University Press in 2021. Like our other research on illegal immigration and crime in Texas, this working paper uses data collected by the Texas Department of Public Safety (DPS) that records and keeps the immigration statuses of those arrested and convicted of crimes in Texas. As far as we’ve been able to tell, and we’ve filed more than 50 state FOIA requests to confirm, Texas is the only state that records and keeps the immigration statuses of those entering the criminal justice system. Texas gathers this information because its runs arrestee biometric information through Department of Homeland Security (DHS) databases that identify illegal immigrants. Unlike other states, Texas DPS keeps the results of these DHS checks that then allows a more direct look at immigrant criminality by immigration status.

The results are similar to our other work on illegal immigration and crime in Texas. In 2018, the illegal immigrant criminal conviction rate was 782 per 100,000 illegal immigrants, 535 per 100,000 legal immigrants, and 1,422 per 100,000 native‐​born Americans. The illegal immigrant criminal conviction rate was 45 percent below that of native‐​born Americans in Texas. The general pattern of native‐​born Americans having the highest criminal conviction rates followed by illegal immigrants and then with legal immigrants having the lowest holds for all of other specific types of crimes such as violent crimes, property crimes, homicide, and sex crimes.
Not quite as rosy but illegals have HALF the rate of crime than do native born Americans. Interesting. Adding illegals leads to less crime than adding more native borns.

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