Immigration agents have virtually stopped punishing employers of illegal workers. Instead, they are arresting immigrants coming out of jails, packed into smugglers' vans or working at potential terrorist targets. Nationally, the number of employers fined for hiring illegal workers or failing to verify their paperwork dropped from 808 in 1996 to just 13 last year. No one in Colorado has been fined for hiring illegal workers in three years, although a few employers have been prosecuted criminally. Raids at work sites to round up workers have nearly vanished. Arrests in such cases in the U.S. have fallen from 17,552 to...