For the record, the LAPD does not check to see if inmates were sent back to Mexico prior to their current incarceration. Neither do state prisons.
We have recidivist murders, rapists, child attackers et al back on the streets once they've served their current sentence.
LAPD has specificly refused to check the status of illegals they pick up. If they are back in this nation for the 1,497th time, the LAPD could care less. This is even true for known gang members.
Go figure...