Human experimentation was a core feature of the CIA's torture program. The experimental nature of the interrogation and detention techniques is clearly evident in the Senate Intelligence Committee's executive summary of its investigative report, despite redactions (insisted upon by the CIA) to obfuscate the locations of these laboratories of cruel science and the identities of perpetrators.
At the helm of this human experimentation project were two psychologists hired by the CIA, James Mitchell and Bruce Jessen. They designed interrogation and detention protocols that they and others applied to people imprisoned in the agency's secret "black sites."
In its response to the Senate report, the CIA justified its decision to hire the duo: "We believe their expertise was so unique that we would have been derelict had we not sought them out when it became clear that CIA would be heading into the uncharted territory of the program." Mitchell and Jessen's qualifications did not include interrogation experience, specialized knowledge about Al Qaeda or relevant cultural or linguistic knowledge.