Musing on immigration detainers....

In a recent article in the local paper, a number of local sheriffs noted that they are refusing to honor detainers issued by ICE because it would require them to detain them longer than their given sentence, and that would be a violation of their rights.

And you know, as much as I want our government to show the door to criminal immigrants (legal or illegal), I've got to respect that.  It is in effect an unlawful extension of their sentence.  But that said, let's ask a simple question.

With only 340 sanctuary cities (about ten of them within 30 miles of my home and probably another dozen within 100 miles of my home), exactly what prevents ICE from, say, showing up to apprehend them on the scheduled day of their release?  A quick look at the locations of sanctuary cities seems to indicate that about a dozen teams of ICE agents with a van of bus could apprehend almost all of the 9000 or so criminal illegal immigrants that sanctuary cities release each year and make sanctuary cities, counties, and states really a moot point.

Do we have an immigration crisis, a sanctuary city crisis, or simply a lack of clear thinking in Washington, DC?