This term is meant to indicate two groups of people
1) Aliens who are currently serving prison or jail terms
2) Aliens who are active in gang activity.
For that reason ALL repeat ALL ICE investigative personnel have been physically transferred away from the suburban and residential raids that were common under Bush.
In the San Diego sector only one non criminal undocumented worker has been taken into custody this year and the ICE officer involved was reprimanded.
getthefacts posted this OP that indicated that
concerned about being in an ambiguous status that he would turn himself in for deportation. He received a letter with the following statement
“After reviewing the information you have provided, I have determined that Mr. GetTheFacts does not meet this office’s investigative priorities and therefore I must deny your request to commence removal proceedings”. http://www.democraticunderground.com/discuss/duboard.php?az=show_mesg&forum=389&topic_id=8722917&mesg_id=8722917This confirms what my ICE sources have told me. You could go to the nearest ICE office and wear a shirt saying "I am an undocumented illegal alien" and they will not bother you.
There is one gray area. Sometimes ICE will investigate employers who are engaged in other illegal activity, like conspiring to specifically recruit undocumented workers or hiring underage documented workers or abusing undocumented workers. In some cases some of the workers that have been detained in those raids have been deported while others have been allowed to stay. This is a very very small number however.
This is a clear change between the Bush and Obama administration. Some people might think that there is no difference between the two administrations but law abiding undocumented aliens are not among them.