[Rim05]

But police were deeply divided on the matter, with police unions backing it but the state police chief's association opposed the bill, contending it could erode trust with immigrants who could be potential witnesses.

As far back as 1947 the hispanics would never work with the LAPD. They would rather live with their criminals than report them.
I don't know why the police keep touting that 'gaining their trust' bit. No trust has ever existed.