With some languages it will be hard to know for sure if the people are genuine. I for one, don't know a thing about Vietnamese, so unless we know the LM longer and trust him/her, we can just never be sure if the translators are all genuine (and with that I am not saying it's that particular team who is doing any crazy transfers...I just gave an example). So I think @elear's idea of bringing in external translation experts to do checks sometimes might be the best solution for this.