In connection with any investigation of a charge filed under section 2000e–5 of this title, the Commission or its designated representative shall at all reasonable times have access to, for the purposes of examination, and the right to copy any evidence of any person being investigated or proceeded against that relates to unlawful employment practices covered by this subchapter and is relevant to the charge under investigation.

The Commission may cooperate with State and local agencies charged with the administration of State fair employment practices laws and, with the consent of such agencies, may, for the purpose of carrying out its functions and duties under this subchapter and within the limitation of funds appropriated specifically for such purpose, engage in and contribute to the cost of research and other projects of mutual interest undertaken by such agencies, and utilize the services of such agencies and their employees, and, notwithstanding any other provision of law, pay by advance or reimbursement such agencies and their employees for services rendered to assist the Commission in carrying out this subchapter. In furtherance of such cooperative efforts, the Commission may enter into written agreements with such State or local agencies and such agreements may include provisions under which the Commission shall refrain from processing a charge in any cases or class of cases specified in such agreements or under which the Commission shall relieve any person or class of persons in such State or locality from requirements imposed under this section. The Commission shall rescind any such agreement whenever it determines that the agreement no longer serves the interest of effective enforcement of this subchapter.