What is the current requirement for showing proof of funds when re-entering Thailand: 20k or 500k baht?

The consensus among commenters is that while the official requirement for visa purposes is proof of 500,000 baht, it is generally more difficult to verify such funds if they are held in foreign banks. When re-entering Thailand, tourists are often only required to show 20,000 baht in cash. However, there have been reports of increased scrutiny for first-time arrivals at certain entry points, suggesting it may be beneficial to be prepared to show the larger amount if necessary.