Pls check the post from Xie. 回複:Are you sure?

回答: I think it usually starts aft. finger print.turion2006-05-20 10:53:46

http://immigration.wenxuecity.com/BBSView.php?SubID=xielaw&MsgID=18

Guess nobody knows for sure; since it's also done by FBI, chances are USCIS will iniate the request once the fingerprint is done. Just a guess

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