45 CFR § 91.41 - Compliance reviews.
(a)HHS may conduct compliance reviews and pre-award reviews or use other similar procedures that will permit it to investigate and correct violations of the Act and these regulations. HHS may conduct these reviews even in the absence of a complaint against a recipient. The reviews may be as comprehensive as necessary to determine whether a violation of the Act and these regulations has occurred.
(b) If a compliance review or pre-award review indicates a violation of the Act or these regulations, HHS will attempt to achieve voluntary compliance with the Act. If voluntary compliance cannot be achieved, HHS will arrange for enforcement as described in § 91.46.