Now in Phuket, taking fingerprints to conduct a criminal record check before issuing marriage certificate.
This because they think foreigners are just marrying for the Visa and possibility to stay longer.
They can only check for criminal records within Thailand, it is not possible to check for records in other countries.
But if you have company or children or been long time in Thailand the papers can be done in one day, if you are here short time as tourist it will take longer.
TLDR : Answer Summary
In Phuket, a new requirement has been implemented for foreigners wishing to marry, where they must submit fingerprints for a criminal record check before receiving a marriage certificate. This measure has been introduced amid concerns that some foreigners may attempt to marry Thai nationals primarily to obtain a visa or extend their stay in Thailand. The criminal record check is limited to records within Thailand, and while those with longer residency or family ties may process their paperwork more quickly, tourists may face longer processing times.