Thaidetectives.com , a network of professional private detectives in Thailand. They provide only trained and highly experienced private detectives in Thailand who speak English, Swedish, Thai and Lao.
As mentioned on their site, they provide a detective to work at any area in Thailand and also specified on their website that, they use the most recent technology for video and audio surveillance's. By using thaidetectives.com, one can get their job done easily just by paying online also.
If anyone thinking of setting up a business in Thailand, this site is the best way to start, as they do background checks on business partners, employees, Ex-employees, cheating spouse, girlfriend and boyfriend.
Visit their website to know more about their fidelity tests and also check out the testimonials section.