Secure Communities is the name of a federal program to identify criminal aliens. When someone is booked into your local jail, fingerprints are taken and sent to ICE to determine if the person is in the country illegally, or I assume a legal immigrant would be identified who is wanted in another jurisdiction (like the Somali guy in North Dakota recently).
To see if your county is participating, check out “Deportation Nation.”
I see no counties in North Dakota participate.
From time to time readers ask what they can do. This is something you can do politically and locally—push your county government to enroll in Secure Communities.