28 CFR Part 36 Nondiscrimination on the Basis of Disability by Public Accommodations and in Commercial Facilities (2010 ADA Title III Regulations with amendments issued through Dec. 2016)

(3) A public accommodation shall not rely on an adult accompanying an individual with a disability to interpret or facilitate communication, except—

(i) In an emergency involving an imminent threat to the safety or welfare of an individual or the public where there is no interpreter available; or

(ii) Where the individual with a disability specifically requests that the accompanying adult interpret or facilitate communication, the accompanying adult agrees to provide such assistance, and reliance on that adult for such assistance is appropriate under the circumstances.