When a foreign worker is given a mandatory health check-up, there is a process for issuing a medical certificate. It must be a medical certificate in the prescribed form.
Foreigners who have entered Thailand but wish to change their visa to work in Thailand must submit an application to change their existing visa to a Non-Immigrant Visa “B,”
Regarding foreigners who come to work in Thailand by means of smuggling or human trafficking to work without a work permit or work other than their right to do so.
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