The Secretary shall not under the authority of this section require any employer or any plan, fund, or program to submit to the Secretary any books or records more than once during any 12-month period, unless the Secretary has reasonable cause to believe there may exist a violation of this subchapter or any regulation or order issued pursuant to this subchapter, or is investigating a charge pursuant to section 2617(b) of this title.
29 U.S. Code § 2616. Investigative authority
Section effective 6 months after Feb. 5, 1993, except that, in the case of collective bargaining agreements in effect on that effective date, section applicable on the earlier of (1) the date of termination of such agreement, or (2) the date that occurs 12 months after Feb. 5, 1993, see section 405(b) of Pub. L. 103–3, set out as a note under section 2601 of this title.