When, in the 1960s, the federal government began requiring ethical review of proposals seeking funding for medical experiments, regulators expected that the review would be conducted by experts in the field. Thus, the U.S. Public Health Service's PPO #129, "Clinical Investigations Using Human Subjects" (8 February 1966), required "prior review of the judgment of the principal investigator or program director by a committee of his institutional associates," presumably other doctors or biomedical researchers. The 1974 version of 45 CFR 46 [
PDF] required that each IRB be composed of "not less than five persons with varying backgrounds to assure complete and adequate review of activities commonly conducted by the organization. The committee must be sufficiently qualified through the maturity, experience, and expertise of its members and diversity of its membership to insure respect for its advice and counsel for safeguarding the rights and welfare of human subjects."
In response to concerns that researchers could not be trusted to watch other researchers, in 1981 the Department of Health and Human Services added the requirement that "each IRB shall include at least one member whose primary concerns are in nonscientific areas; for example: lawyers, ethicists, members of the clergy." [
PDF] The language of the provision shows that the department did not imagine applying these rules to nonscientific researchers (such as lawyers, ethicists, or members of the clergy), but that's not the point here. The point is that the regulations' drafters expected IRBs to be dominated by experts "possessing the professional competence necessary to review specific research activities," with one or two lay members added to represent the conscience of the community.
Recently, some have called for a greater role for non-expert members. In 2001, for example, the
National Bioethics Advisory Commission recommended that "members who represent the perspectives of participants, members who are unaffiliated with the institution, and members whose primary concerns are in nonscientific areas . . . should collectively represent at least 25 percent of the Institutional Review Board membership," rather than the single member now required.
But a bigger problem may be not a lack of lay representation, but a lack of expertise.