or more specific detail regarding the requirement (such as in statute, regulations, etc...). Seeing that this appears to be absent from official sources, then the best available information does seem to be of the anecdotal sort

Well it is absolutely an 'official' Thai government (MFA) requirement, which can be enforced. I carry a local Thai Bangkok Bank savings account book with me, just in case, even though I have never had to use it. I never have 10,000 baht, or the equivalent in cash, on me.

Are you looking for published details in Thai? Or is English OK?

http://www.mfa.go.th/main/en/service...Exemption.html

- Foreigners entering Thailand under the Tourist Visa Exemption category must possess adequate finances for the duration of stay in Thailand (i.e., cash 10,000 Baht per person and 20,000 Baht per family).


http://www.phuketgazette.net/phuket-...941#ad-image-0

During the recent crackdown ( May-ish to September-ish) a colleague flying into BKK for the first time in 6 months, did meet with a few challenges including having to show cash. However, that is but one anecdotal data point, and the desperation for tourists seems to have pivoted back to the traditional laissez-faire attitude.