authority, signing to keep pace with the speaker. >> sidely side, dreaming the same dream. >> reporter: but this interpreter at nelson mandela's service was a fake, according to the deaf federation of south africa. they claim he's had no formal training. the signs he's making are not used in south after kaj sign language, and he never used facial expressions, a key part of signing. >> but one expert says the signed name no mbeki never appeared. the deaf community in south africa is outraged. >> he's a fake interpreter, signing arbitrary signs. >> a deaf member of the parliament tweeted during the ceremony, he's just making up, get him out of tv sight. that lawmakers is an alum of gallaudet university in washington, the world's only liberate arts college for the hard of hearing. melanie metzger says he doesn't