previous refusals no longer exist or are not applicable any more (even if the refusals did not previously happen in the country the applicant is seeking a visa for) cannot prove to have strong ties to their current country of nationality or residence (for those who are applying for temporary or non-immigrant visas) intends to reside or work permanently in the country she/he will visit if not applying for an immigrant or work visa respectively fails to demonstrate intent to return (for non-immigrants) fails to provide sufficient evidence/documents to prove eligibility for the visa sought after does not have a legitimate reason for the journey does not have adequate means of financial support for themselves or family does not have adequate medical insurance, especially if engaging in high risk activities (e.g. rock climbing, skiing, etc.) does not have travel arrangements (i.e. transport and lodging) in the destination country does not have health/travel insurance valid for the destination and the duration of stay is a citizen of a country to which the destination country is hostile or at war with has previously visited, or intends to visit, a country to which the destination country is hostile has a communicable disease, such as tuberculosis or ebola, or a sexually transmitted disease has a passport that expires too soon Even if a traveller does not need a visa, the aforementioned criteria can also be used by border control officials to refuse the traveller's entry into the country in question. Visa policies The main reasons states impose visa restrictions on foreign nationals are to curb illegal immigration, security concerns, and reciprocity for visa restrictions imposed on their own nationals. Typically, nations impose visa restrictions on citizens of poorer countries, along with politically unstable and undemocratic ones, as it is considered more likely that people from these countries will seek to illegally immigrate. Visa restrictions may also be imposed when nationals of another country are perceived as likelier to be terrorists or criminals, or by autocratic regimes that perceive foreign influence to be a threat to their rule. According to Professor Eric Neumayer of the London School of Economics: The poorer, the less democratic, and the more exposed to armed political conflict the target country is, the more likely that visa restrictions are in place against its passport holders. The same is true for countries whose nationals have been major perpetrators of terrorist acts in