Qualified interpreter
(xx) Qualified interpreter means an interpreter who is able to interpret effectively, accurately, and impartially, either for individuals with disabilities or for individuals who are limited English proficient. The interpreter must be able to interpret both receptively and expressively, using any necessary specialized vocabulary, either in-person, through a telephone, a video remote interpreting (VRI) service, or via internet, video, or other technological methods. (1) Qualified interpreter for an individual with a disability includes, for example, a sign language interpreter, oral transliterator, and cued-language transliterator. When an interpreter is provided to a person with a disability, the qualified interpreter must be able to sign or otherwise communicate effectively, accurately, and impartially, both receptively and expressively, using any necessary specialized vocabulary. (2) Qualified interpreter for an individual who is limited English proficient means an individual who demonstrates expertise and ability to communicate information effectively, accurately, and impartially, in both English and the other language, and identifies and employs the appropriate mode of interpreting (e.g., consecutive, simultaneous, or sight translation).
Source
29 CFR § 38.4
Scoping language
For the purpose of this part