regulation-assigned role role of impartial witness Person: Helen Parkinson a role which inheres in a Homo sapiens and is realized during a clinical trial - the impartial witness is independent of the trial and cannot be unfairly influenced by people involved with the trial impartial witness role of impartial witness According to GCP , an impartial witness should be present for an illiterate subject. PharmPK Discussion, http://www.boomer.org/pkin/PK06/PK2006253.html Person: Jennifer Fostel impartial witness. A person, who is independent of the trial, who cannot be unfairly influenced by people involved with the trial, who attends the informed consent process if the subject or the subject's legally acceptable representative cannot read, and who metadata incomplete