Question: what is the difference between request for initial evidence and request for evidence?
Answer: Answer: If the USCIS determines that a Request For Evidence (RFE) must be issued, then the RFE will cover all needed evidence. If the RFE is for “additional evidence” which is required to assist an USCIS officer in making a decision rather than an RFE for “initial evidence” which is required to make a petition case.