Originally Posted by 2lz2p
As mentioned you can also apply for a Non-immigrant "O-A" Visa in your home country. You will need to check with the Thai Embassy/Consulate on their particular requirements for documentation which will include a police report and a medical certificate (neither of which are required if applying for extension in Thailand). They may also require that documents be notarized, e.g., bank letter attesting to funds on deposit or letter from your income source if using monthly income to qualify.