So, does anybody have any detailed information about what happens to a Thai national if they have overstayed in another country. I'm hearing that Thai immigration makes it their business to police these matters and that the Thai national's passport is "updated" to reflect that they overstayed which would obviously impeded any international travel in future.

...

My wife use to work for an airline and she remembers being asked specifically to escort passengers arriving that were known to be overstayed in their countries of origin. She recalls taking these people to immigration where they were required to sign some paperwork and their passports were stamped to indicate that they had overstayed in their country of origin. Said stamping would certainly making future international trips difficult. And my wife encountered cases where the last name of the Thai already indicated that she was married to a westerner.

You might want to read this thread if you have not done so.

http://www.thaivisa.com/forum/index.php?showtopic=21033

Steffi...........I dont think being married to a foreigner makes any difference for overstaying. Why overstay? Just get the visa extended legally or etc. The women whom were "deported" due to overstaying........most probably their husbands didnt have the means to keep them there or didnt want them anymore.

If you cant stay in the country anymore, then just go back, whats the big deal? At least the person would not be illegals in their own country and have a better chance of securing a job or being independant.