Not everyone who wants a visa is eligible for one. The US State Department classifies people with certain health or behavior characteristics as ineligible and denies them entry. The classifications can get complex, and there are often exceptions, but according to the State Department people who fit the following descriptions may not enter the US.
Certain health conditions are considered a threat to the US population. You may be refused entry if you:
Except for strictly political misdeeds, a criminal record makes it difficult to obtain a visa. You are ineligible for a visa if you:
Anyone who could pose a threat to US security is ineligible for a visa, including people who:
Additional Ineligible Classes
Laborers Aliens seeking to perform skilled or unskilled labor may only be admitted if the Secretary of Labor determines this would not negatively affect US workers. Aliens Unable to Self-Support Aliens seeking legal permanent resident status must prove they are able to support themselves without government assistance. This list is not exhaustive, and the details can be confusing. Visit the State Department web site for more detailed information and possible exceptions to certain ineligibilities. If you are unsure if any of the categories apply to you, you may want to consult an attorney experienced in immigration law.