Summary: Immigration and Naturalization Service (INS) officials believe that some aliens are using the benefit application process to carry out illegal activities, such as crimes of violence, narcotics trafficking, and terrorism. The extent of immigration benefit fraud is unknown, but INS officials and others believe that this problem will increase as smugglers and other criminal enterprises use fraud to bring illegal aliens, including criminals, into the United States. INS investigative units in both the service centers and the district offices investigate possible benefit fraud on the basis of information they receive from staff who process benefit applications, other INS units, the public, and law enforcement agencies. Providing immigration benefits in a timely manner may conflict with the goal of preserving the integrity of the legal immigration system. Although INS recognizes the need to balance these competing goals, it has not always succeeded. INS has several performance measures in place to gauge the results of its benefit fraud enforcement activities. However, INS has not established outcome-based performance measures to assess the results of fraud activities. Additionally, INS has not established goals or measurement criteria for the service center units that are responsible for fraud investigations.