CITI Training Practice Exam

An employee at the research site should not serve as a witness to a patient's consent because they are directly involved in the trial and could potentially have a conflict of interest. This prevents any bias or pressure on the patient's decision to participate. Option A is incorrect because even if the employee is not involved in the specific trial, they are still affiliated with the research site and could have prior knowledge or relationship with the patient. Option C is incorrect because there may be certain circumstances where the employee's involvement in the trial could pose a conflict of interest. Option D is incorrect because they should not be authorized by the IRB to serve as a witness due to their involvement in the trial.