Can my family use US dollars instead of Thai baht for entry into Thailand?

A family of five visiting Thailand in July will need to show proof of having 40,000 baht for entry. The question raised is whether these funds can be in US dollars instead of Thai baht. Responses indicate that it is typically expected to present the amount in baht, and travelers should be aware of potential variations in requirements at different immigration offices. Communication with immigration and specific local practices is advised.