10 C.F.R. § 712.15
(c) Alcohol testing. All HRP candidates and HRP-certified individuals are subject to testing for the use of alcohol, as required by this part. The alcohol testing program must include, as a minimum, an initial alcohol test prior to performing HRP duties and random alcohol tests at least once every 12 months from the previous test, and tests of HRP-certified individuals if they are involved in an incident, unsafe practice, occurrence, or based on reasonable suspicion. The supervisor who has been informed that an HRP-certified individual's confirmatory breath alcohol test result is at or above an alcohol concentration of 0.02 percent shall send that individual home and not allow that individual to perform HRP duties for 24 hours, and take all appropriate administrative action consistent with § 712.13(f).
(3) The following constitutes a refusal to submit to a test and shall be considered as a positive alcohol concentration test of 0.02 percent, which requires the individual be sent home and not allowed to perform HRP duties for 24 hours:
(d) Occurrence testing.
(1) When an HRP-certified individual is involved in, or associated with, an occurrence requiring immediate reporting to the DOE, the following procedures must be implemented:
(e) Testing for reasonable suspicion.
(2) Reasonable suspicion must be based on an articulable belief, drawn from facts and reasonable inferences from those particular facts that an HRP-certified individual is in possession of, or under the influence of, an illegal drug or alcohol. Such a belief may be based on, among other things: