49 CFR § 392.71
Radar detectors; use and/or possession
November 18, 2020
(a) No driver shall use a radar detector in a commercial motor vehicle, or operate a commercial motor vehicle that is equipped with or contains any radar detector.
(b) No motor carrier shall require or permit a driver to violate paragraph (a) of this section.
[58 FR 67375, Dec. 21, 1993]