If you returned home with your Form I-94 (white) or Form I-94W (green) Departure Record in yourpassport, it is possible that your departure was not recorded properly. If you departed by a commercial air or sea carrier (airlines or cruise ships), your departure from the U.S. can be independently verified, and it is not necessary to take any further action, although holding on to your outbound (from the U.S.) boarding pass – if you still have it – can help expedite your reentry next time you come back to the United States.If you departed by land, private vessel or private plane, you will need to take steps to correct the record. If you do not validate your timely departure from the United States, or, if you cannot reasonably prove you departed within the time frame given to you when you entered, the next time you apply for admission to the U.S., Customs and Border Protection (CBP) may conclude you remained in the U.S. beyond your authorized stay. If this happens, your visa may be subject to cancellation or you may be returned immediately to your foreign point of origin.If you failed to turn in your I-94 Departure Record, please send it, along with any documentation thatproves you left the United States to:DHS – CBP SBU1084 South Laurel RoadLondon, KY 40744To validate departure, CBP will consider a variety of information, including but not limited to:1. Original boarding passes you used to depart another country, such as Canada, if you flew homefrom there;2. Photocopies of entry or departure stamps in your passport indicating entry to another country after you departed the United States (you should copy all passport pages that are not completely blank, and include the biographical page containing your photograph); and3. Photocopies of other supporting evidence, such as:Dated pay slips or vouchers from your employer to indicate you worked in another country after you departed the United States, Dated bank records showing transactions to indicate you were in another country after you left the United States, School records showing attendance at a school outside the United States to indicate you were in another country after you left the United States, and Dated credit card receipts, showing your name, but, the credit card number deleted, for purchases made after you left the United States to indicate you were in another country after leaving the United States.We strongly urge you to keep a copy of what you send to DHS-CBP and carry it with you the next time you come to the United States in case the CBP Officer has any questions about your eligibility to enter. Carrying those materials with you will also allow your record to be corrected at the time of entry if, for some reason, the London, Kentucky office has not yet done so.