28 C.F.R. § 35.134 : Judicial Administration — DEPARTMENT OF JUSTICE — NONDISCRIMINATION ON THE BASIS OF DISABILITY IN STATE AND LOCAL GOVERNMENT SERVICES — GENERAL REQUIREMENTS — Retaliation or coercion

(a) No private or public entity shall discriminate against any individual because that individual has opposed any act or practice made unlawful by this part, or because that individual made a charge, testified, assisted, or participated in any manner in an investigation, proceeding, or hearing under the Act or this part.
(b) No private or public entity shall coerce, intimidate, threaten, or interfere with any individual in the exercise or enjoyment of, or on account of his or her having exercised or enjoyed, or on account of his or her having aided or encouraged any other individual in the exercise or enjoyment of, any right granted or protected by the Act or this part.

28 C.F.R. § 35.134