Security check procedures are also affected by the applicant’s field of interest. Consular officers must determine whether or not a person’s activity in the United States would involve exposure to any sensitive technologies included in the Technology Alert List (TAL). Certain fields of interest may raise concern and generate the need for further visa clearance procedures. Government officials recognize the importance of scientific exchange supporting a wide range of research and development in the U.S. as a vital component of our national security. There is a concerted effort to clear legitimate travelers as quickly as possible and at the same time to deter or prevent potentially inadmissible travelers from gaining entry to the U.S.