What do I do with the I-94 that I forgot to return when I departed the US? Failure to turn in your I-94 when you leave the U.S. can create a serious problem. Without this record of your departure, you will be identified in the Department of Homeland Security’s (DHS’s) records as an "overstay." Being identified as an overstay means that you will be denied re-entry into the U.S. If you failed to turn in your I-94, please send it - along with any documentation that proves when you left the U.S. to ACS Inc. 1084 South Laurel Rd. London Kentucky 40744