Those thinking about applying for a United States visa are well advised to conduct thorough research into immigration matters generally with a specific emphasis upon the visa category which most closely comports with ones intentions. It should be noted that some individuals and businesses opt to retain the services of a professional to assist with matters pertaining to US Immigration. Those claiming expertise in United States immigration matters ought to be asked to produce credentials since only an attorney licensed to practice law in one or more American jurisdictions is allowed to practice U.S. immigration law.