If DOE determines that an HRP candidate or HRP-certified individual has used any hallucinogen, the individual is not eligible for certification or recertification unless:

1. (a) Five years have passed since the last use of the hallucinogen;
2. (b) There is no evidence of any flashback within the last five years from the previous hallucinogen use; and
3. (c) The individual has a record of acceptable job performance and observed behavior.