Whenever you apply for any visa in Thailand you always need to bring a copy of your passport and it's always required to have a copy of your documents so this also applies if you are applying for an Elite visa. A copy of the identification page of your passport will be sent to the Immigration office for a due diligence check. This is to insure that you are not on the blacklist, watching-list, or anything that would prevent you to obtain the Visa.
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