7 U.S. Code § 138c - Samples
The Secretary shall ensure that performance evaluation samples are provided to any laboratory that has applied for accreditation under this chapter.
A laboratory described in paragraph (1) shall analyze such performance evaluation samples and submit the results of such analysis to the Secretary, as provided for in section 138a of this title.
The laboratory shall submit the results of the tests conducted under subsection (a) to the Secretary on forms provided by the Secretary, on or before the date determined by the Secretary.
The Secretary shall ensure that performance evaluation samples for analysis are provided to laboratories accredited under this chapter not less than two times a year.