CSM here:
"In fact, the emphasis peaked in that period (the 1980s) with the INS spending about 5 percent of its budget on work-site enforcement, says Mr. Rosenblum, then began to lag behind other priorities.
Since the 9/11 attacks, there has been even less focus on interior investigations. The government formed the Department of Homeland Security, which took in INS and made Immigration and Customs Enforcement (ICE), responsible for interior investigations, but they've focused much more intently on border enforcement.) In fiscal 2004, ICE issued three notices of its intent to fine a business for hiring illegal immigrants - down from 417 five years earlier, according to a 2005 report by the Government Accountability Office."
The Senate voted Tuesday to fine employers who hire illegal immigrants up to $20,000 for each unauthorized worker, providing teeth to a broad immigration bill before sending it to a final vote later this week.