Lab. Code, § 6320

(a) If, after inspection or investigation, the division issues a special order, order to take special action, or a citation for a serious violation, and if at the time of inspection the order is not complied with or the violation is not abated, the division shall conduct a reinspection in the following cases:

(1) All inspections or investigations involving a serious violation of a standard adopted pursuant to Section 6401.7, a special order or order to take special action, serious violations of those orders, and serious violations characterized as repeat or willful or with abatement periods of less than six days. These reinspections shall be conducted at the end of the period fixed for compliance with the order or abatement of the violation or within 30 days thereafter.

(2) At least 20 percent of the inspections or investigations involving a serious violation not otherwise scheduled for reinspection. These inspections shall be randomly selected and shall be conducted at the end of the period fixed for abatement of the violation or within a reasonable time thereafter.

(b) Whenever a serious violation is not abated at the time of the initial or subsequent inspection, the division shall require the employer to submit a signed statement, with supporting evidence, where necessary to prove abatement, under penalty of perjury, that he or she has complied with the abatement terms within the period fixed for abatement of the violation. The division may grant a modification pursuant to subdivision (g) of Section 6319 only if the employer has abated the violation at the time of the initial or subsequent inspection or the statement, signed under penalty of perjury, and supporting evidence are received within 10 working days after the end of the period fixed for abatement. At no time shall the period for abatement be fixed prior to the issuance of a citation. The submission of a signed abatement statement shall not be considered as evidence of a violation during an appeal. The division shall include on the initial notice of civil penalty a clear warning of reinspection for failure to submit the required statement in the time allotted, and of an additional, potentially substantial monetary penalty for failure to abate the violation. If the division fails to receive evidence of abatement or the statement within 10 working days after the end of the abatement period, the division shall notify the employer that the additional civil penalty for failure to abate, as provided in Section 6430, will be assessed retroactive to the end of the abatement period unless the employer can provide sufficient evidence that the violation was abated prior to that date. The division shall conduct a reinspection of serious violations within 45 days following the end of the abatement period whenever it still has no evidence of abatement.