28 CFR Part 35 Title II Notice of Proposed Rulemaking (NPRM) (published 2008)

(c)

(1) A public entity shall not require an individual with a disability to bring another individual to interpret for him or her.

(2) A public entity shall not rely on an individual accompanying an individual with a disability to interpret or facilitate communication, except in an emergency involving a threat to public safety or welfare, or unless the individual with a disability specifically requests it, the accompanying individual agrees to provide the assistance, and reliance on that individual for this assistance is appropriate under the circumstances.