Immigrants, documented and undocumented, are major contributors to our economies. There is no scientifically sound evidence that they commit crimes at any higher rate than the general population; the evidence shows that they are less likely to do so. What's more, the evidence shows (and common sense dictates) that undocumented immigrants and those who live with them are less likely to report crimes or seek medical or other aid when there's a risk they could be turned over to the Feds for deportation. That makes all of us less safe. Leave sanctuary cities alone - and learn from them!