The Secretary shall administer a National Laboratory Accreditation Program under which laboratories that request accreditation and conduct residue testing of agricultural products, or that make claims to the public or buyers of agricultural products concerning chemical residue levels on agricultural products, shall be determined to meet certain minimum quality and reliability standards.
7 U.S. Code § 138a - National Laboratory Accreditation Program
(a) Establishment of Program
(b) StandardsThe Secretary of Health and Human Services, after consultation with the Secretary and the Administrator of the Environmental Protection Agency, shall establish, through regulations, standards for the National Laboratory Accreditation program  that shall include—
standards applicable to laboratories;
qualifications for directors and other personnel; and
standards and procedures for quality assurance programs.
(c) Accrediting bodiesThe Secretary of Health and Human Services shall approve State agencies or private, nonprofit entities as accrediting bodies to act on behalf of such Secretary in implementing the certification and quality assurance programs in accordance with the requirements of this section. In making such approvals the Secretary of Health and Human Services shall—
oversee and review the performance of any accrediting body acting on behalf of the Secretary to ensure that such accrediting body is in compliance with the requirements of the certification program under this section; and
(d) RequirementsTo be accredited under this chapter, a laboratory shall—
prepare and submit an application for accreditation to the Secretary; and
(e) ExceptionsThis chapter shall not apply to—
a laboratory operated by a government agency;