Kindly explain about the FBI fingerprint clearance?
A. Please be advised that the fingerprint checks for I-600/A Petitioners are valid for 15 months from the date of clearance. They are not valid throughout the 18 month I-600A validity period. Therefore, in many cases the Petitioners and any other adult household members will have to have their fingerprints taken and cleared a second time before an I-600 petition can be filed/approved. You can find this policy on our website at http://www.uscis.gov/portal/site/uscis.