A prospective client’s complete entry and exit history to the United States is one of the most important pieces of information to gather so that you can properly evaluate their immigration case. However, sometimes it can be challenging to figure out what questions to ask to elicit the information you need, or what the answers mean. This practice advisory describes different types of entries to the United States—entries without inspection, entries with valid documents, entries with fraudulent documents, “wave throughs”—as well as different outcomes of unsuccessful attempted entries—voluntary returns or expedited removals—and the legal significance of these different entries and attempted entries. We also provide suggestions for questions to ask clients to identify what happened at each entry or attempted entry. This discussion applies to entries and attempted entries made by people who are not lawful permanent residents; it is primarily meant to help you assess a client’s options for obtaining legal status, by understanding their entry and exit history to the United States.