Another problem (there are many others) is that "sanctuary cities" do not report crimes that illegals commit even when federal law requires them to do so. Whatever requirements (income, entitlemants, crimes) you write into the law, there are those who will ignore them.
For selective law enforcement, we have
I won't even mention rogue courts.
Newt lost his mind years ago.
Another is that they refuse to acknowledge that the perps in many unsolved "stranger-murder" cases, officially of "unknown" ethnicity, are in fact known statistically (by comparison with similar crimes which the victims survived to give descriptions of the attackers) to be young black men.
In the 1990's, young black men were responsible for 91% of all murders in which other blacks were the victims, and half of all murders in which non-blacks were the victims. (This last was the figure that crime statistics were being munged to conceal and obscure.)
Since the number of murder victims (about 24,000/year) was almost exactly half black and half nonblack, that meant that the one takeaway that crime statisticians were forbidden from discussing in public was that young black men were committing 75% of ALL the murders in America, and that they were "murdering out" at a rate equal to half the rate at which they were murdering other blacks (usually other young black men) in the drug turf-wars of those years.
Hey, does this qualify for Holder's "courageous" and "honest" discussion of race in America? If so, I wish he'd tell his statisticians to quit lying by omission.
Oh, and the verboten statistic, then, was that black criminals were murdering 6000 nonblack citizens every year ......ten times the rate at which nonblack criminals were murdering black citizens ..... a nice comparison with the 4700 blacks total who were lynched in the U.S. from 1865 to 1962.