Not every visa is approved. Sometimes, people don’t provide enough information at their immigration interview. Other times, officials learn that someone has a specific situation that makes them ineligible. For example, if officials learn of a previous immigration violation, a previous removal, a criminal conviction, an error in labor certification approval, an infectious disease, or a security risk, they will deny an immigrant visa. In some cases, an experienced immigration attorney may find a remedy for your ineligibility such as a waiver.