I'm glad you are such an expert on the law.
You have been brainwashed by these liberal mouthpieces who get on tv and spout their pro-Vincente Fox claptrap day in and day out.
Local law enforcment doesn't have any power to enforce immigration laws. Nonsense.
A US Border Patrol agent once told me that if, on the local level, the mayors would invite them back into the cities, they could do their job there and enforce the federal immigration laws.
Local LE can enforce trespassing, but to what extent are they willing to go? I'd imagine it varies from city to city.
I'm not claiming to be an expert. Have you ever been ticketed for speeding by a local PO on a state highway?