Which entity has the responsibility of investigating any bias on employment tests in the United States?

The Equal Employment Opportunity Commission (EEOC) is the correct entity responsible for investigating any bias in employment tests in the United States. The EEOC aims to ensure fair treatment in employment practices, including the administration of testing for hiring. The Commission enforces federal laws that make it illegal to discriminate against a job applicant or an employee based on several protected characteristics. One of its crucial roles includes analyzing whether employment tests disproportionately impact certain groups in a discriminatory manner, ensuring that all candidates have equal opportunity without bias.

While other organizations may engage in testing and accreditation related to employment, they do not hold the same level of authority or responsibility for investigating potential biases in the employment testing process as the EEOC does.