I don't know why the previously started thread (by someone else whose I thank for this important link) was deleted. I am not a lawyer, but please see the link below and send it to as many of your family/friends as you can.

http://www.chirla.org/knowyourrights#preview

NEVER SIGN ANY PAPER.
NEVER LET ICE ENTER YOUR HOUSE WITHOUT SEEING WARRANT OR DEPORTATION ORDER SIGNED BY JUDGE FIRST.
NEVER SAY HOW YOU ENTER THE COUNTRY.
NEVER RESPOND TO IMMIGRATION STATUS INQUIRES.
SAY YOU NEED TO TALK TO A LAWYER.