Royal Thai Embassies and Royal Thai Consulates-General have the authority to issue visas to foreigners before their travel to Thailand. However, the immigration officers are the ones who have the authority to permit entry and stay in Thailand. In some cases, the immigration officer may not permit a foreigner holding a valid visa to enter Thailand should the immigration officer find reasons to believe that he or she falls into the category of aliens prohibited from entering Thailand under the Immigration Act B.E. 2522 (1979). In accordance with this Act, foreigners who fall into any of the following categories are prohibited to enter Thailand:
- Having no genuine valid passport or document used instead of passport; or having a genuine valid passport or document used instead of passport without valid visa issuance by the Royal Thai Embassies, the Royal Thai Consulates-General or the Ministry of Foreign Affairs, with exception of those who meet visa exemption requirements. The terms and conditions of visa issuance and visa exemption are prescribed by the Ministerial Regulations.
- Having no appropriate source of living following entry into the Kingdom.
- Having entered the Kingdom to be employed as an unskilled or untrained laborer, or to work in violation of the Alien Work Permit Law.
- Being mentally unstable or having any of the diseases stated in the Ministerial Regulations.
- Having not yet been vaccinated against smallpox; or inoculated or undergone any other medical treatment for protection against disease; and having refused to have such vaccinations administered by the Immigration Doctor.
- Having been imprisoned by judgement of the Thai Court; or by lawful injunction or judgment of the Court of a foreign country, except for when the penalty is for a petty offence, or negligence or is provided for as an exception by the Ministerial Regulations.
- Having behavior which could cause possible danger to the public or having the likelihood of being a nuisance or constituting any violence to the peace, safety and security of the public or to the security of the nation; or being under warrant of arrest by competent officials of foreign governments.
- Reason to believe that entry into Kingdom is for the purpose of being involved in prostitution, the trafficking of women or children, drug smuggling or other types of smuggling which are against public morality.
- Having no money or bond as prescribed by the Minister under Section 14 of the Immigration Act B.E. 2522 (1979).
- Being a person prohibited by the Minister under Section 16 of the Immigration Act B.E. 2522 (1979).
- Being deported by either the Government of Thailand or that of other foreign countries; or having been revoked the right of stay in the Kingdom or in foreign countries; or having been expelled from the Kingdom by competent officials at the expense of the Government of Thailand unless exemption is provided by the Minister on an individual basis.
Whether travelling for business or pleasure, foreigners must understand and respect the Thailand law. And if the foreigner has the intention to work in Thailand, he or she must obtain a valid non-immigrant visa and work permit under his or her employing company in Thailand. Contact ThaiLawyers for work permit and visa application process.