47 CFR § 73.1217 - Broadcast hoaxes.
No licensee or permittee of any broadcast station shall broadcast false information concerning a crime or a catastrophe if:
(a) The licensee knows this information is false;
(b) It is forseeable that broadcast of the information will cause substantial public harm, and
(c) Broadcast of the information does in fact directly cause substantial public harm.
For purposes of this rule, “public harm” must begin immediately, and cause direct and actual damage to property or to the health or safety of the general public, or diversion of law enforcement or other public health and safety authorities from their duties. The public harm will be deemed foreseeable if the licensee could expect with a significant degree of certainty that public harm would occur. A “crime” is any act or omission that makes the offender subject to criminal punishment by law. A “catastrophe” is a disaster or imminent disaster involving violent or sudden event affecting the public.