Happened to me last July as we moved in the different city have had an appt for my younger daughter for immunization at her 18 mo there was terrible interpreter knows nothing but hearing way when u first met hearing people and tried to sign with ur body language, u know, I was like WTF? is she certified interpreter?! and my girls's father looked at paper by Dr looking and writting and asking QQ the interpreter kept pointing to my older daughter is she breastfed, potty trained and e.t.c. I was like why Dr asked such QQ to my older daughter she is 5 yrs old Dr knows better I havent heard 5 yrs old being breastfed and still on diapers, e.t.c. HUH? we made an appt for our younger daughter so he saw name of younger daughter there and stopped with his hand to the interpreter face no more signing for us* and we wrote to Dr to correct, Dr knew it then we left that room we asked that interpreter about her certified she replied not have but working as a nurse at hospital that how Dr heard about that and asked to come for us, OIC. I called that Dr as we re unpleased Dr should have known better to get certified interpreter(ofc, I may see here many certified interpreter not really skills, others really good skills but no certified, funny!?! but that terrible interpreter is worst nothing ASL!) and Dr apologized will inform that hospital. My shoulder surgery checked up at that hospital still now for P.T. they got better, certified, interpreter 
