The Ministry says the crackdown is aimed at preventing visa runners who abuse the visa exemption scheme from working illegally in Thailand.
In the letter, which ThaiVisa obtained a copy of, the Foreign Ministry confirms earlier information that visa runners will be prohibited from entering Thailand as of August 12 this year.
Long-stay visa applicants are advised to acquire appropriate (ie, Non-Immigrant) visas at Thai embassies or consulates before coming into the country.
The national commander of Immigration, Lt Gen Pharnu Kerdlarpphon confirmed to The Phuket News on May 13 that his officers were already applying strict controls on "out-in" visa runs, saying "Lots of nationalities come to Thailand on tourist visas but they come to work. I really want them to do the right thing, not try to dodge around the law and evade taxes."
ThaiVisa notes, "The letter sent out by the Ministry of Foreign Affairs may also be a strong indication that the Royal Thai Embassies and Consulates may have been instructed to be restrictive in issuing multiple back-to-back tourist visas."