Unfortunately you can't go by their background because if you are coming off the street you don't know anything about legitimate certificates and in my case the instructor was training since he was like 9 years old in dozens of competitions, lots of trophys and well know, with the appearance of ...

I too had a similar experience the best advice I can give is Pay attention to how he socializes with you, is he flirting, does he act differently toward you than the other students, is he attempting to have any personal relationship with you outside of class, if so trust me he is not an honorable ...