Peter L. Markowitz, who teaches immigration law at Cardozo and directs its immigration legal clinic, said the memos obtained in its lawsuit reflected the Bush administration’s effort to appear tough on immigration enforcement during the unsuccessful push to pass comprehensive immigration legislation in 2006, and amid rising anger over illegal immigration.

“It looks like what happened here is that the law enforcement strategy was hijacked by the political agenda of the administration,” he said.

Showing good numbers became a higher priority for ICE than following its mission -- and so ICE quietly changed its mission. Although ICE repeatedly told Congress that it was focusing its resources on immigrants with criminal backgrounds, when it changed the rules in 2006 it didn't bother to tell Congress. After all, the truth might have jeopardized the increased funding that ICE enjoyed.

The methods ICE used to make those numbers are suspect:

Michael Wishnie, one of the authors of the report, who teaches law at Yale, said that random arrests of low-level violators in residential raids not only raised a new set of legal and humanitarian issues, including allegations of entering private homes without warrants or consent and separating children from their caretakers, but was “dramatically different from how ICE has sold this program to Congress.” ...

During [a 2007 in New Haven] raid, lawyers at Yale’s immigration law center said, agents who found no one home at an address specified in a deportation order simply knocked on other doors until one opened, pushed their way in, and arrested residents who acknowledged that they lacked legal status.

Janet Napolitano has "ordered a review of the fugitive teams operation." She should order it to return to its original mission and to stop lying to Congress about its results. While she's at it, she should order ICE agents to respect the Fourth Amendment.