@Steve ******

Steve, be careful not to spread outdated information. The Antigen-Test was sufficient until 21.12.2021. Then the rules changed. Now it is said, "passengers who arrive in Thailand under Test and Go and the Sandbox Programme must undergo their 2nd COVID-19-test using the RT-PCR technique (not ATK self-test) at government-designated facielities (no additional costs)". And at the hotel, where I spent my 1-day quarantine on 25.12./26.12. to wait for the result of the first RT-PCR test, I had to sign a form which said "this person must go to do the RT-PCR test on day 0-1 and 5-7 after arrival at designated lab centers.". I think it would not have been wise to ignore it.

@Charlie ***********

see my posting above