You’ve given your attorney all the requested documents. All forms have been signed, T’s crossed and I’s dotted. And off goes your application or petition to US Citizenship & Immigration Services (USCIS). Now all you have to do is wait for an approval notice in the mail, right? But you receive a letter that requests “additional evidence.” The dreaded RFE (Request for Evidence). What does it mean? How do you respond? Why did this happen?